Did you contact support desk or you have used Loading... - Form by Asana form ? In first case, they are saying, they will reply within 1-2 weeks and yet they might redirect you to 2nd option and in 2nd case it goes to developer and they will not come back unfortunately. 
You can also try to raise their attention on SLACK, but no assurance anyway.
It depends, what is size of your smart-home (there is script which you can use for this), how often this happens (every day or 1 time per week ?), do you reboot regularly eg. every day (highly recommended for eg. >45 apps and >150 devices based on my own experience) ?
You may also try to install latest experimental firmware - when enabled in Homey Developer Tools (but beware of the risks…) 
Hard and easy way. Hard way is to do the USB backup, then decompress it eg. using 7ZIP and then eg. looking on /user partition searching for last log in homey-pro.log - but it will be for your own use unfortunately. There is also different way which I would not comment here.
Easy way - implement eg. InfluxDB and monitor CPU and memory utilization (it might gives you higher resolution) - which you can also do using Insights. I have eg. installed sysinternals app and when the free mem reach critical level, I initiate restart prior lock-up.
Sysinternal app will tell you, if the temp is the issue, you can also check on Homey Developer Tools, search for Temp and Throttle.
As Athom support would say - Have fun !
Note : This is just a joke, they are working on fixing the issues but it’s taking time unfortunately
