Question Seeking help, intermittent disconnect, upload drops to 0 but download continues working for awhile

[SillyGoose2000]

I'm on a wired connection and all devices on the network experience this issue. My internet service is standard copper cable internet. This issue has persisted the entire time I've lived in this apartment, essentially, the internet will fully drop out in 2-10 minute intervals throughout the day. When it does drop out, the upload will fail first, however the download will continue without issue for some time, as in, if I'm in a voice call I can hear the other person for several minutes, however they will not hear me, and a ping test to google.com will fail as I cannot send packets. The ISP has sent a technician twice and both times they simply tested the signal levels on the line and found them to be normal. The modem/router combo is plugged directly into the wall outlet. Have already tried any number of full resets on the router, using other outlets, disabling band steering, etc etc. There are only two ISPs in my area and this is the cheaper of the two, so my preference is to try and troubleshoot it, but if this sounds like an unfixable issue let me know. Thanks in advance.