Constant latency and dropouts on wireless

I'm writing becuase I think I've exhausted all of the options I can come up with on my end. My problem started several months ago, but seems to be inconsistent. I often get bad latency spikes on wireless on my home network. I have a DOCSIS3 modem with a D-Link DIR645 router. This prolem has persisted through 3 different modems, and 4 different routers. I've checked my modem signal strength on the local network, and it seems to be within the acceptable thresholds on my end. I don't seem to have many problems when I'm wired (i've got a PS4, Xbox 360 and Xbox One direct wired), but I'm primarily using netflix, so I don't know that i'd notice small latency issues or infrequent dropouts. The problem seems to be much worse via wifi - I've been running a ping -t for the past 10 minutes or so, and these are my results:
    Packets: Sent = 2020, Received = 1942, Lost = 78 (3% loss),
Approximate round trip times in milli-seconds:
    Minimum = 9ms, Maximum = 3817ms, Average = 300ms I'm 20 feet from my router at the most. Signal strength is excellent in the bedroom and den. I've tried switching wifi channels, hopping channels, using static channels.. and nothing seems to resolve it. I do have a few other networks in the area, but nothing extreme (i'm in a 6 unit complex). It seems like if I have multiple things streaming at once (IE: netflix in the bedroom, standard browsing, or maybe some audio streams in the den) the problem gets even worse. I've got a buddy that's a tech that suggested I may have degradation in the lines before it gets to my condo. Every time I've called support I haven't got anywhere, as it looks like the signal is ok on their end. If anyone can help, or point me to a direction where someone had a similar problem, I'd be very appreciative. Thanks,John

I can't help but have exactly the same issue you describe and have done exactly the same things you did and problem persists. Just got the new latest and greatest modem from Comcast which promised to correct the problem. It didn't. It is very frustrating.

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