intermittent internet connectivity ever since maintenance in my area

My internet connection drops several times an hour for a minute or so ever since maintenance was performed in my area. TV on the wireless box, desktop computer, mobile device; anything connected to the internet cuts out. I can not join a work meeting, stream, or game without issues. I did not have these issues before the maintenance was performed in my area. I called support and they said that my modem was forcing restarts. They worked on it for a bit but it did not fix the issue. I got a new modem; this also did not fix the issue. I had a technician to my place. He inspected/replaced the connections in my place and said everything looked fine. This is the same issue that I am having when I contact support as well. The internet is working fine when they check it at that moment. The issue is that it is cutting out intermittently. Shouldnt there be logs of my internets uptime that somebody can see so they can see the issue? I also mentioned to support on the phone about how this has been occurring ever since maintenance was performed and they brushed it to the side and did not look into it further. How can I escalate this issue to the proper channels? Calling support or having a technician to my place is not working for me because they run the basic checks and see that the internet is working and then do nothing further.