@FYDR , my issues was the modem, have it switched out more than once if you have too. Some modems devices may have intermittent problems, even ones that already replaced previously. I think at times when a modem is returned, people forget to mentioned the modem has intermittent problems and then refurbished and returned to service again for someone else.
Being an IT guy for 35+ years, intermittent issues are the worst problems to solve with any hardware. I recall when I use to fix main frames, PCs, etc., I had to replace the same part 4 times before I got one that resolved the issue. The information one can provide to the tech, the better chance the issue can be solved. Use the virtual repair tool to check things out as well, that can fix some problems.
Look at the modem logs for clues (export the logs into Excel works best), and note if it happens the same time everyday. My issue occurred the about the same time each day initially, then happen twice a day at different times fairly constantly. What I always found odd is why it occurred around the same time every day. Once I replaced the modem at least twice, the issue finally stopped.
