Beginning of transmissions always have sync loss

[Austin Hruskach]

All of my P25 transmissions get sync loss for the first frame or two across all TGIDs and Sites. I use 4x rtl-sdr V3's and they all have the same symptom. I did A test with rtl_test and I got data loss at the very beginning of the test, just like sdrtrunk... It does this for all six of my RTL-SDR V3's, on 3 different PCs, and both on Windows 10, 11, and Linux.

[Erik Swan]

It could be a USB issue. I would try to isolate the problem by unplugging all unecessary USB devices and test with a single RTL-SDR plugged directly into a USB port on the host (without any USB hubs, docks, extension cables, etc.)

Either way,  if rtl_test is showing the problem, then it's almost certainly not an issue with sdrtrunk itself and you may have better luck asking in a general RTL-SDR/SDR support forum.