Screen is shutting down while using zoom meeting program

I bought my surface pro 7 at the end of January and until last week I didnt have any problem,but last week, it shut down suddenly when I left the pc idle. This was the first time. and then the next day its screen started to shut down suddenly and randomly in the middle of the "zoom" meeting. The other peoples voices kept coming but there was no image on the screen. It was dark. This problem still going on and it is very annoying. I tried using "zoom" on the another pc which has win 10, and I didn`t have any problem. Actually this shutting down randomly and suddenly problem must be solved immediately, because the devices are expensive and I paid a lot of money on it and we are more dependent  the computers nowadays than it was due to the extraordinary times we are going through due to the coronavirus situation.Do you have any advises for me to apply on my computer to fix it? Is it a general problem? Is it going to be solved or are we going to give up buying microsoft devices anymore? Please help and inform me as soon as possible.