M.2 ssd vanishes

I have a Razer Blade 17 Gaming Laptop, Intel Core i7-11800H, 32GB RAM, 1TB NVMe. It came with an M2 ssd which contained the operating system (Windows 10, updated to 11 v23H2).
Some time ago I added a second M2 ssd into the spare slot. This was used for documents. Every so often the second drive ‘vanishes’. I can usually get it back by going into the bios and reconfiguring the NVME with F3 ‘optimized defaults’.
Last week I decided to install a second OS (Windows 11 v23H2) on this second drive. Already I’ve had two boot problems as the drive couldn’t be found.
Is there any way to ’cure’ this?

Derek Clements

I wonder if your bios cmos battery needs to be replaced?

Thanks. Is there anyway of checking this without taking the laptop apart?
I was also wondering whether the M.2 might be slightly loose and this might change the configuration if it momentarily lost contact? I haven't checked this.
Also, it only ever happens to this second drive.