Regular crash/reboot: furi_check failed

Firmware 0,86,2 recently repaired
Sleep mode: legacy

If Bluetooth is not enabled everything I have tried so far (IR, NFC, sub-GHz) works fine.

If Bluetooth enabled about every 20 minutes the Flipper crashes and reboots with the message “furi_check failed”. The only device it has ever paired with is a Fire tablet with the Android mobile app (very slick) installed. If I remove this pairing then enable Bluetooth the crash doesn’t appear to happen.