sync time synchoniztaion failure, streaming buffering

I started having issues with select streaming services buffering about a month ago. I installed cm1000v2 modem with eero mesh system and the problem sill persists. The log shows sync time synchonization failure errors. I don't know anything about networks and errors. Called Netgear router help line and was told I need to activate security on the modem which is only free for the first week and then I have to pay $149 a year?? So I don't think I should have to pay for my router to work, and honestly since this started before this router was installed I have no confidence that paying will fix the problem. Can anyone help me understand if this is a Netgear issue or an ISP issue? Or another issue? I am nearing my wits end with my streaming not working! I have 500 Mbps speed, have unplugged and replugged, uninstalled and reinstalled, changed my whole Internet system, called Hulu support, emailed peacock support, nobody will tell me how to fix. No uncorrectable codewords in log, argh!