> My guess is the ambient temperature is causing some metal component to contract and break a connection.

That failure mode is less likely to cause a "well-known problem" and would show up in other circumstances (not just temperature).

I thought maybe capacitance, but it looks as though they are designed to be fairly flat deltas around 20°C:

https://www.murata.com/products/emiconfun/capacitor/2012/10/...