Shelly unit reboots when toggling

[Pro2collab]

Thanks for your work on this FW. I have tried the latest Tasmota 13.4.0 and STM32 firmware 51.7 (All the latest)
Followed all the steps here: https://templates.blakadder.com/shelly_Dimmer_2.html

I have a few Shelly Dimmer 2 and they all have the same result after the above implementation.
The lights stay on permanently, regardless of hard button connected to Shelly and switching this
The web GUI for Tasmota Toggle, cause the Shelly to restart (also indicating in a brief break in a constant ping)
Sometimes the toggle doesnt cause the restart and the lights brightened up a bit, but moving the dimmer setting causes random cases of flickering or shelly reboot.

I have also then tried the below versions according to to eliminate, but the same results
I also then tried Tasmota 9.2.0 and STM32 firmware 51.5

Any suggestions or something I may be overlooking? Anything else I need to clarify in my setup ?
Any help would be appreciated. I was tired of the Shelly default Firmware which also caused flickering, but no reboots.

Thanks