It seems pretty reproducible. I’ve had difficulty for weeks now getting live RTK Integer fixes with RTCM3 messages. (See Difficulty getting live RTK Fixes with 2.1.6)
I’m only using GPS satellites given that I was getting worse results with GLONASS and SBAS. I’m sending RTCM3 1002, 1006, 1008 messages.
I ran this test where I started with UBlox in Hold and Fix mode and quickly got a fix (16:25), switched to Continuous and quickly got a fix (16:30), reconfigured to use RTCM3 and got no fixes (16:33-16:41) then reconfigured to UBlox and got a Fix again (16:42).
I uploaded the logs here: