Ongoing Connectivity Issues

Hello everyone. Over the past few weeks, I have been having problem with random disconnects. I have lived at my current address for the past 3 1\2 years and this has been a problem since day one. It will usually clear up on its own but it will always come back after awhile. I've performed countless hours of troubleshooting and have had many technicians out to my apartment over the years and the problem always comes back to bursts of high levels of noise out on the node causing intermittent problems with my upstream SNR. My modem is an Arris SB8200, but this can be ruled out as a culprit since these drops affect all of my devices (2 cable boxes) simultaneously. During these drops, my modem always shows that the upstream power levels have jumped from ~35dBmV to up to ~58dBmV which is indicative of noise on the upstream channels. Multiple techs have checked my lines and they have all said that they are clean. During these drops, my neighbors (even in differct buildings) have said that they aere also having connection issues, so it isn't just me. I'm got fed up with trying to call tech support only for them to send yet another technician out and ultimately get nowhere, so I thought I would try posting here instead. Honestly, it feels like no one is actually trying to find out where all of this interference is coming from and intead the symptoms are merely being treated as they appear. I do understand that some level of noise is to be expected, but when it's causing your customers to keep losing connection then its a problem. Any help in this matter would be greatly appreciated.