Node has no ethernet

I have been running a umbrel node on a raspberry pi4 4gb with a 2tb ssd, for about 3 months with out any issues but yesterday found that the raspberry pi was on but there was no Ethernet activity or ssd activity, was not able to find my node on my network Is it possible to resolve this issue or setup Wifi to start the node back , or will I have to start over from scratch and build a new node, your help would be greatly appreciated , Tony