For the past 1.5-2 months now, our LTE hub resets randomly. The case is fairly warm when it does. It seems to happen whenever someone tried to download or update something. Has anyone else had this problem? We called Telus and got the usual "bring it in so we can send it away" line. I just might try chopping up the case and letting it have some airflow and see what happens.
Modifying the case is not recommended. You could do more harm than good, especially on devices with antennae which may depend on the case design to work properly. Mobile phones are a perfect example of that.