The problem for NVE

When the system varied into NVE, the system’s temperature sharp increase.Could you please tell me the reason for this case .And what should I do to solve the problem.**The problem has bothered me for a long time.**Thank you very much!!!

When the system varied into NVE, the system's temperature sharp
increase.Could you please tell me the reason for this case .And what should
I do to solve the problem.The problem has bothered me for a long time.Thank

impossible to say with no context. could be anything. most likely
there is something wrong somewhere.

Your posts sounds more like a Shakespeare’s excerpt than an actual description of a scientific problem. Please reboot and try explaining your situation in more detail.
Carlos