Convergence issue in Large Signal S-Parameter simulation

Hello All,

I'm try to make a RF-DC converter, which includes some diodes.
When I'm trying to match the input side for a specific power in LSSP simulation, say for 5dBm, I'm getting the following graph,

I can see a sudden jump for a very small frequency change. Is there any change to be made in the 'Solver' settings?Please help

Regards
Vysakh