windows 7 – PC internet connection goes offline intermittently, but always comes back online when I turn on my cell phone

Intermittently, my internet connection will terminate (I get the yellow exclamation point icon in my system tray). When this happens, I can consistently bring it back online every time by turning on my Galaxy S6 phone. It’s been doing this for a few years and I am just now getting around to asking about it.

About my system

  • Windows 7 (come at me)
  • PC connects directly to cable modem
  • Phone connects to wifi
  • I use syncthing to sync between phone and PC. First thought is to uninstall syncthing, but the issue is very intermittent and might not occur for several days on end

Anyone ever heard of such a thing?