7010B GC-MS TQD high vacuum turns off on its own

Hello,

I am using a 7010B GC-MS TQD and when I perform the air/water check in the morning everything looks good i.e H2O, O2, N2 reading all below 5%. But when I perform a 2nd and 3rd air water check the water readings jump to around 13% H2O and I notice the high vac is set to off. How come did high vac is shutting off on its own? I realize it is suppose to be around 10e-5 Torr for the high vac and around 100 mTorr for the rough vac.

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