Glad sorted...

I had similar happen due scene size and texture complexity overwhelming the PP_11 garbage collector. Eventually, reduced render cache and shrank render size from wiiiide 'letterbox' to near-default, until GPU render worked again. By trial and error, found size limit was my twin GPU cards. CPU render still worked, but ran much, much slower.

Priced upgrade for my now-ageing GPU cards, found I could build an entire Ryzen7 (16 thread !!) CPU-only network render box for less than a significant upgrade to either GPU card. Downside, Windows' workgroups, which I've yet to convince to 'play nice'...

Added: Ha !! Have just discovered 'network path' file sharing option which, in addition to offering a 'name-input' field, has drop-down list including 'Everyone'... {Facepalm...}