Power up your Rig one by one and monitor the specific rig that causes the problem (internet disconnection)
If you found one, unplug and clean the ethernet cable then try it again. if fails try to replace that ethernet cable.
The possible reason of your intermittent internet is a shorted ethernet cable thru RJ45.
Dont forget to check the connection from switch to router.
If this solves your problem you can donate to my eth address
0x00a039c13dE7E071C68ad48088beC775dCb83f35
or
Give me a simple trust rating, Thank you