Connections wi-fi and speeds SOS different day!

Question

    How many other comcast subscribers have their own modems, like the Motorola brand that they encourage you to buy at Best Buy from a Comcast Rep. that works there??  Well, I was told to save paying a modem fee a couple years ago and bought my own that a Rep from Comcast highly suggested. Ever since I have owned it, comcast has been manipulating all sorts of things on it according to Motorola. I once called comcast because my connection service was bad and speeds were bad etc. The tech came out, and in approx. 60 seconds said your modem needs to be replaced, it's not working. He said I have one out on the truck. I said will I have to pay a monthly fee, he said YES!! But of Course!! I knew it was coming because it wasn't the first time they said it was my Modem. So I callled Motorola and expalained the problem. They said they would trouble shoot for $40.00 and would only take about 20 minutes. I agreed and they said the defaults were changed, etc. and nothing was wrong with Modem. They went on and fixed the changed issues and modem worked great! Twice I paid that fee because Comcast said it was a bad modem. They constantly change my wi-fi connection to xfinity when it supposed to connect to MY OWN ENCRYPTED device name!! My pc sits and I see the little spinning ball because there is no connection and Ihave to keep going into wi-fi setting EVERY DAY and reset back to my default setting. Speeds continue to vary greatly and it's very frustrating. Even the speed on my tv with the new box at times it takes the graphics longer to load, just like a slow computer speed when pictures load very slow. Some times they are lighting fast!!Anyone else ever send back equipment to comcast??? Well I did, and got an email saying we will advise you when we get your back. Even though I have proof through UPS they kept saying we will let you know within 2 weeks. Well it's been 2 months and no confirmation that anytihng was received!! Are they holding this over my head so that as soon as I dump comcast they will charge me for that equipment???? Your bills still inching up by a couple dollars every month??? Yup, as always. One day comcast will get what they deserve. Yes I am making arramgements to get rid of this once and for all but not before I take many more with me who have the same issues. Time to just stream from ROKU, or other good programs they have out there, and there are plenty of free streaming for us seniors with low income and terrible illnesses that all we can do is watch tv most of the day. Comcast, also said I would get a free voice remote with my new X1 box. Ask me if I got it??? NOPE!!

Answer 1

You're going to be troubleshooting this and probably eventually discussing this with Verizon.
In the typical small dynamic-IP network setup, the WiFi router gets its address from Verizon via DHCP, and the WiFi router then issues "private" addresses to your clients via its own DHCP server.
Restarting the WiFi router can cause address collisions, as the cheaper WiFi routers don't probe for existing clients and just start handing out addresses and this quite possibly leads to address collisions.   The smarter WiFi routers will probe the network and determine if an IP address is already in use, and will then avoid passing it out again.
if your WiFi router supports it, I'd look to move to 5 GHz — from what I can tell from what few specs available, it doesn't appear to support 5 GHz — as the 2.4 GHz band tends to be heavily used in apartment buildings and built-up areas, and with excessive interference resulting.  (Though your attempts to use a hard-wired connection imply a problem with the WiFi router or with the DSL.)