Hi @Gordon Martin,
I just tested this exact scenario using the following software version and firmware version and was not able to achieve a "crash"
PTZOptics Control App v1.4.1
PTVL Firmware Version v7.2.82
If you are not currently running the latest firmware or software version(s) I would recommend starting with updating those.
The one thing that does occur, because the camera reboots when changing a resolution, is that the connection will be broken.
A simple stop and start of the video stream will bring the live feed back to life once the camera has fully rebooted for full adjustment.
I hope these suggestions and comment help you to achieve your desired production.
If you have any additional questions please do not hesitate to return to the forums.