How to solve CST MWS error

I have problem while I'm simulating a nanoantenna structure with cst.
i use time domain solver and plane wave excitation.
but it has an error and I can't get any result can you halp me whit this?
The error is:
"The calculation seems to be unstable! Transient solver is restarted with a scaled timestep by 0.85."
thanks in advance

Im having the same issue. Any advice?

To decide a problem go to Home -> Setup Solver -> Specials -> General -> Stability factor for timestep -> decrease this value (default value is 1). Try with 0,9; 0,8; 0,7.