UM982 internal error

Hello All

I seem to be having an issue with um982 gps.

All has been working well, I upgraded to Rover 4.53 and now seem to be getting PreArm: Internal errors 0x100000 l:256 flow_of_ctr.

If I do a preflight reboot the error disappears vehicle operates as usual but on full power cycle PreArm: Internal errors 0x100000 l:256 flow_of_ctr returns.

Also if I boot autopilot then plugin GPS 20sec after boot no internal error occurs. Seems to be a boot sequence issue.

On the Messages screen on Mission planner the boot sequence doesn’t seem to get past the EKF3 IMU initialised point.

Does anyone have any thoughts?