Hey, it also happened to me.- I got my SM2.0 A350 yesterday, i did a firmwareupdate and printed today, the whole day.
The print stops at 99% and it seems the print is finished so far.
The printhead freezes at the last position and turns off the heat.
Stopping the print with the touchscreen is not possible.- i touched STOP, after a while there comes a disconnect pic.- If i touch disconnect, it askes me if i want to stop the current print.- if i touch disconnect YES it does nothing.
Then i disconnected the powersupply from the 230V source.
After that it asks me if i want to recover.- I pushed YES.- The machine did homing and got back to the right position but there was no heated bed or print head temperature on…
It stays at 99%, 2sec remaining with no heat. If i touch STOP again, the same procedure restarts.-- Seems to be a bug 
By the way, the stl was sent via wifi from latest luban V3.4.2 and started from the sm2.
Firmware: V1.7.1.1_20200408
Touchscreen: V1.7.1.1
Controller: V1.7.0.1_20200401
here is the stl. :A350_Bottom Reinforcement fast MK2 v3_17min_15_shouldbenice.gcode (482.6 KB)
here is the log:log_SM2A350_FWV1.7.1.1.rar (39.5 KB)
@JKC20 @Rainie @parachvte
Why is the powersupply that loud?- omg
EDIT: Its a bit strange, you just could disconnect if you are connected to the wifi, but you get automatically disconnected after starting the uploaded file?- I think i was disconnected while printing.
EDIT2: It happened again, the print after the 1st fail.