Debugging :: Frequent BSOD Without Dump Files - SSD Not Found?

I bought my Sony VAIO flip on 12 Feb this year. At the beginning of April it started frequently crashing (a few times a day when using it on my commute and in the evening). It (almost) always crashes with a BSOD, but no error code, and no crash dump generated. About a quarter of the time, upon restarting from the crash, its says "Couldn't start Windows. Internal SSD not found". I'd keep restarting it and it would fail to start with the same error. If I leave it for a while (30 mins+), it restarts fine, until the next crash.

Given the 'SSD not found' errors, I had assumed it was a hardware fault with the drive failing intermittently. This would also explain the lack of crash dumps if the drive had issues and Windows couldn't write to it. However, I've read around and found some SSDs displaying this behaviour after a crash due to unexpected power loss to the drive, so I'm now wondering if this is a symptom not a cause.

Furthermore, windows restore does show windows updated some drivers at the beginning of April when the crashes started.

I did have one crash with and error code and a dump (24th April) but this is the exception. From the event log (occurrences of id 41 "The system has rebooted without cleanly shutting down first") I can see crashes a few times a day every day I've used the computer in April:

Date Count
14-Feb 1
17-Feb 4
05-Mar 1
06-Mar 1
08-Mar 1
09-Mar 1
18-Mar 1
22-Mar 1
23-Mar 1
28-Mar 1
29-Mar 1
31-Mar 2
03-Apr 2
04-Apr 4
05-Apr 2
06-Apr 6
07-Apr 4
08-Apr 1
16-Apr 6
17-Apr 3
20-Apr 3
21-Apr 5
22-Apr 1
23-Apr 2
24-Apr 8
25-Apr 2
26-Apr 6

I've tried cloning the hard drive to an external one and booting from that to eliminate issues with the internal hard drive but I can't really get that to work.