Hi..
I have the same.
And this happens spontaneously.
Europe was applying for siglent EU, they were redirected to the Russian company Prist.
Prist replied that if they did not buy from them, then we will not help.
That is, there was no help from the siglent.
The oscilloscope was bought on aliexpress, but now everything is gone.
I disassembled the oscilloscope, on the USB chip board, U33 U46 U78, and the U126 memory,
on the right, were flooded with a large layer of flux. Washed the flux, but it did not help.
Put the fan-turbine on the blowing of the processor, heated to 60 degrees, also did not help.
When the oscilloscope stops responding to the buttons, the signal is displayed.
There are cases that it hangs completely, and strange points may appear on the display.
checked on the firmware both 5.1.3.17R1 and 5.1.3.13
Now I sit I think, what else to do.
mb/sn BA