Convergence problem-Dielectric Barrier discharge

Hello

I am modelling an AC-DBD. I am facing convergence problem as i run my model. The error that shows up is
Repeated test error failures
Failed to find consistent initial values.
Last time step is not converged.
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I know that this problem can be due to too large initial step size or un-smooth boundary conditions. To me, my boundary conditions make sense and I have to simulate my model in picoseconds to see the streamer propagation.

I will appreciate if anyone can guide me through this. Please find attached my model.

Thank you

Best regards
Zaid