ISP Failed, Internet Connection Intermittent

     For a long time, my internet connection has gone through phases in which pages, images, videos, etc. stop loading something like every 1-2 minutes. I have seen gifs start loading incredibly quickly, in real time almost, then stop dead. Refreshing in this case yields an endless period of loading. I am fairly certain that this problem extends to all devices on my wireless network, but I rarely use two computers simultaneously, so I'm not certain of this. The problem is usually present for a few weeks at a time, then is stops happening for a month or two, if I remember correctly.
     Whenever pages fail to load, I have found that, by opening Network Diagnostics (System Preferences>Network>Assist me…>Diagnostics…), I can temporarily restore internet connectivity. The Network Diagnostics window usually has orange lights for ISP, Internet, and Server when I first open it, though ISP's light is sometimes red. As I proceed through the program, the lights usually change after I select my network from the list. Network Settings will sometimes turn red, at which time all the lights below it will turn red as well. Whether or not this happens, though, the lights end up as green, and I am told that my internet connection seems to be working correctly. Most of the time, my internet connection will then work for some time (the length of which may vary). I have pored over all of Apple's network troubleshooting articles, none of which have resolved my issue. I have restarted my router and modem in the past, though not recently. I do not believe that the problem lies in either my iMac or wireless router (Time Capsule, 2 terabytes, 4th generation or earlier), as my modem (or possibly cable splitter) seems the liklier culprit, but my landline phone service and cable television service has not seen any service disruptions (all 3 services operate over the same cable, and are provided by the same company).
     During a recent interruption of service, I used the ping command in Terminal to try to connect to the 8.8.8.8 server. The full text of the command and its output is as follows:
Rays-iMac-8:~ lorenzocastoldi$ ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
ping: sendto: No route to host
ping: sendto: No route to host
Request timeout for icmp_seq 0
ping: sendto: No route to host
Request timeout for icmp_seq 1
ping: sendto: No route to host
Request timeout for icmp_seq 2
ping: sendto: No route to host
Request timeout for icmp_seq 3
ping: sendto: No route to host
Request timeout for icmp_seq 4
ping: sendto: No route to host
Request timeout for icmp_seq 5
ping: sendto: No route to host
Request timeout for icmp_seq 6
ping: sendto: No route to host
Request timeout for icmp_seq 7
Request timeout for icmp_seq 8
Request timeout for icmp_seq 9
Request timeout for icmp_seq 10
Request timeout for icmp_seq 11
Request timeout for icmp_seq 12
Request timeout for icmp_seq 13
Request timeout for icmp_seq 14
Request timeout for icmp_seq 15
Request timeout for icmp_seq 16
^C
--- 8.8.8.8 ping statistics ---
18 packets transmitted, 0 packets received, 100.0% packet loss
I followed this with a traceroute command to the same server.
Rays-iMac-8:~ lorenzocastoldi$ traceroute 8.8.8.8
traceroute to 8.8.8.8 (8.8.8.8), 64 hops max, 52 byte packets
1  * * *
2  *traceroute: sendto: No route to host
traceroute: wrote 8.8.8.8 52 chars, ret=-1
*traceroute: sendto: No route to host
traceroute: wrote 8.8.8.8 52 chars, ret=-1
^C
I can't find much on this "sendto: No route to host" message, but the few forum posts I was able to find seemed to be made by users of the Linux operating system, or variants thereof, making me even more certain that the issue is with my modem, cable, or ISP. After running Network Diagnostics again, I got this
Rays-iMac-8:~ lorenzocastoldi$ traceroute 8.8.8.8
traceroute to 8.8.8.8 (8.8.8.8), 64 hops max, 52 byte packets
1  10.0.1.1 (10.0.1.1)  2.198 ms  1.216 ms  2.369 ms
2  * * *
3  67.59.227.133 (67.59.227.133)  31.147 ms  8.546 ms  10.267 ms
4  rtr2-ge1-18.mhe.whplny.cv.net (67.83.231.5)  15.358 ms  22.261 ms  12.545 ms
5  65.19.121.217 (65.19.121.217)  14.326 ms
    65.19.121.209 (65.19.121.209)  16.525 ms
    r1-ge6-1.cst.nrwlct.cv.net (65.19.121.161)  14.141 ms
6  451be0d6.cst.lightpath.net (65.19.120.214)  12.331 ms  17.755 ms
    451be0ca.cst.lightpath.net (65.19.120.202)  14.891 ms
^C
for traceroute, and this
PING 10.0.1.1 (10.0.1.1): 56 data bytes
64 bytes from 10.0.1.1: icmp_seq=0 ttl=255 time=2.135 ms
64 bytes from 10.0.1.1: icmp_seq=1 ttl=255 time=2.478 ms
64 bytes from 10.0.1.1: icmp_seq=2 ttl=255 time=2.179 ms
64 bytes from 10.0.1.1: icmp_seq=3 ttl=255 time=1.058 ms
^C
--- 10.0.1.1 ping statistics ---
4 packets transmitted, 4 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 1.058/1.962/2.478/0.539 ms
for ping, in that order. I believe I've heard that the second entry in traceroute, with the three asterisks, is my router. Whenever I run traceroute, entry 2 is always like this, and I think this is the case for other people as well. This would mean, if I am not mistaken, that the first IP address, 10.0.1.1, is the weak link. However, I do not know how to proceed from here. When I traceroute other websites, it always appears as IP address number one, and it is contacted before my router, if #2 is in fact my router. I have read that 10.0.1.1 is also a private IP address, though I do not know exactly what that would mean for me. I am tempted to think that this IP address may be my computer itself, but that wouldn't make sense. It may be my router, again, but I do not know this for certain.
Because this is an intermittent problem, it can be difficult to examine it in any detail, but I should be able to answer most questions about it. If anyone has any potential solutions, or even hypotheses as to the nature of the problem, please let me know. I cannot solve this problem on my own.
tl;dr: What is the 10.0.1.1

I acknowledge that service outages are common, but they shouldn't interfere with my computer's connection to my router, nor should they last for weeks straight or be temporarily resolved by running a diagnostic tool. Plus, my phone and T V would probably go down in that scenario, except for some very special situations. Electromagnetic interference is an explanation I hadn't considered before, but I don't run a cell phone or microwave all day, but only every other month. I'll look into it though—maybe I'll see how my computer communicates with my router during an interruption, or see if any large electronics are running at the time. However, my connection's been fine since I started this thread, when I restarted my base stations. Maybe that's all I needed to do after all. A strange issue nonetheless, though.

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