Plasma goes on for few seconds then switches off

We have a 7800 ICPMS and was working fine until this morning I switched the plasma on and it went on then off in a couple of seconds.

The RefPower goes up from 0 to about 170 and the Forward power up to 1198 then it switched off.

I removed the shield plate: RefPower went up to 209, Forward power went up to 1198 again and switched off.

I put the shield plate back on: RefPower moved from 0,110,484,2268,167,0. Forward power moved 0,749,200,181,0 then it switched off.

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