Recently Heltec made an update to the popular V3 board going from V3.1 to V3.2. The power circuit changed which required a firmware update. Also there was a change made to the BLE antenna to improve Bluetooth performance. The new antenna is a different shape and material to the previous design, most importantly from a case design perspective it is now longer.
In the picture below you can see the antenna change as well as the marking to indicate the board version:
We quickly discovered that while the new V3.2 board would fit in the current case design, the antenna would get compressed which causes the Bluetooth signal to get reflected back to the ESP32 chip which triggers a protection mechanism and results in the board rebooting.
The new antenna design sticks above the OLED screen by 1mm so we have accommodated for in the latest update to the H1 Case Front design V1.3.1 available to download on Printables.
For those that have the V3.1 board, both the older and latest case design are compatible. Those with the new V3.2 board will need the V1.3.1 case design to function reliably.