Hello folks.

I have an unhappy iMac (Retina 5K, 27-inch, 2017)
40Gb RAM
10.15.7


Problem is random restarts. 
First symptom is the mouse freezes then about 30 seconds later the computer 
turns off and restarts.  This happens enough to be very annoying, and has 
occurred whilst I was drafting this message. 

The problem first occurred after I had transported the computer, screen down, 
on the seat of my car. No physical external damage is apparent. 


Problem does occur in Safe Boot mode, though not as frequently as in normal 
mode. 

EtreCheck shows nothing out of order
Rebooting into recovery mode and running both Disk Utility and reload latest 
operating system have been done. 

*** MCA Error Report ***
CPU Machine Check Architecture Error Dump (CPU: Intel(R) Core(TM) i5-7500 CPU @ 
3.40GHz, CPUID: 0x906E9)
CATERR detected! No MCA data found.


I had assumed it was a hardware problem triggered by moving the machine but 
nothing is showing up in any errors that I have seen.  I have removed and 
replaced the RAM.   When running, it functions normally as expected. 

Any thoughts on what else I could do before taking it to the doctor?
Which doctor is recommended. 
I live in Duncraig area. 



Thanks





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