Simulation results are different at different times

[FnLock]

The same circuit diagram, different time and different computer simulation results are different.I simulink a triode amplifier circuit, The input signal is at the microvolt level.

[altenbach]

Attach an example that demonstrates the problem. What is the level of "different"? (very similar? totally different?)

[FnLock]

• Above are my morning results and here are my evening results.It simulates the same circuit.

[tipa]

Upload the file in 'ms' format to clarify all the settings.