Since a few weeks I experience crashes caused by overheating when using more the 2 vcups for a dedicated qubes whilst having high CPU load. Thoose crashes accrue for high cpu load jobs like zoom or compiling lager programs. For a crash to happen, high CPU load (98%-100%) is required for something between 5 and 30 minutes.
Can anybody second that?
Context:
What CPU are you using?
Intel(R) Core™ i7-3840QM CPU @ 2.80GHz
I had this issue some time ago on one of my two T430’s. Replacing the delta-fan with a non-delta one fixed it. But I still have a delta one (less loud) in the second T430 without issue.
Basically: when it’s too hot it’s too hot. Ambient room temperature is a factor (I live in Texas). So I positioned my machine to be on a desk directly under the AC outlet in the ceiling.
Keep in mind: the T430 is designed for 35W CPUs. The i7–3840QM which you and I are using is a 45W CPU, so we are pushing it across it’s design limits from the start. 
It works, but no question you need to keep this machine cool.
In any case this is not a software issue.
Thanks for your reply! You are probably right.
I was aware of my sub optimal cooling system, but I found this behavior appearing suddenly suspicious too.