I had the same problem. Found about that the memory was full. So I deleted a couple of unused apps en everything is working fine again.
What I do think is weird that the amount of apps I had installed haven’t changed in like a year. So I think the apps have grown in size since the last time I looked…
Edit: might not be the problem if you’re having the new homey pro 2023. I’m still on the 2016 version with 512mb