no, usually display will update immediately…
also, you say its only just started, which sounds very strange.
( i assume its not very cold temperatures - normal ambient temps)
unfortunately, it sounds like a hardware issue.
what I would try, ‘just in case’, is to format the sdcard (or use a new one), and try with a new project, and see if its the case - its unlikely a bad sdcard would cause this - but worth a try.
similarly, try the hermod in the case without other modules connected - again, doesn’t sound like a power issue - but its worth trying.
otherwise, I think you need to approach squarp directly, and they can suggest your next course of action - use the contact form