I believe TBM takes hashes during startup of the miner during DAG validation.  There might be something that happens around 3 hours that splits the hashrate for a bit as I am noticing a consistent but transient drop-off in performance about every 3 - 3.5 hours of mining.  But they don't switch pools like other miners do (and lots of users abuse that payment by either stopping and restarting the miner, or blocking the IP that the miner will switch to), and since I have spent a lot of time (and continue to spend time as TBM gets updated so often) tuning TBM my profits are significantly higher than any other green or red mining software -- especially on my 3090 which gets a consistent 133+ MH/s and I could probably push it to 136+ if I wanted to get close to bumping up against thermal throttling.