Hamstring pain only when sitting

I’m a relatively healthy 36 year old male that strength trains 4x week mainly focusing in SBD at typically lower RPEs and I’ve noticed a get a strange pain deep in the belly of my left hamstring when sitting at a desk for too long. If I stand or straighten out my leg for a bit it goes away but prolonged sitting with my knee bent brings it back. I work a desk job so sitting is just part of my day. I have a standing desk that I use to help the symptoms but I’d like to address the actual issue if possible.

I notice no symptoms while lifting or being active. I don’t notice any symptoms when laying down, I’ve limited it to strictly when sitting at a desk (or similar position) in a typical knee bent sitting up position. I haven’t experienced nerve pain, that I know of, before but I’m suspecting that this might be that. Most of the pain presents itself deep in the mid belly of the hamstring but there is a slight shooting feeling down towards my knee but not at my knee or below. I don’t experience back pain or pain in the glute area.

I try not to Google my symptoms because I feel like I’ll just nocebo myself but I’m not really sure what next steps I should try to resolve this issue. Any ideas?

An update, I was recently on a bit of a road trip and the pain would flare up about 60-90 minutes in. Pain is feeling more of a radiating type pain down my leg now. Zero back pain, pain only presents at the top of the hamstring down my leg but not to my foot. Most pain is in the hamstring region.