I can't identify the root cause or reproduce it on my machine, so I've built a special logging build that I'd like you to install. Copy and paste this into your browser:
https://ffb-bridge.com/dl/diag/bsUW9_PlMKDHqzil1MuPT_0g5jEEwkkc_1C2qFo_cDo
1. Note the base and grip models and the firmware version shown in MOZA Cockpit. Include a screenshot of its native trim/button settings if possible. Note whether Cockpit/Device Service and SPAD.next were running during the failure.
2. Close FFB-Bridge, install the diagnostic build, reopen it, and check the version in About. Keep the original profile, force strength, controls and other software settings for the first test.
3. Load the helicopter that showed the problem. With the aircraft parked and a hand on the stick, arm Bridge, hold your usual FTR button for about one second, then release it once.
4. If Safety Stop appears, wait two seconds, then export the ZIP from Support → Diagnostics before restarting Bridge or power-cycling the base. Do not repeatedly press Arm. If it works, export the bundle anyway.
5. Send the ZIP with the firmware version and what was felt: did resistance disappear while held, return on release, and did Safety Stop appear?
This bundle will capture more data to help me narrow down the root cause.