The gps lost its signal for about 30 seconds.. then came back up for about a minute and then lost the signal again for 30 secs.
I am assuming a handheld GPS not a panel mount? Which is why I said we had to differentiate. I have NEVER lost a signal on a panel mount IFR GPS even when I have had an antenna full of water.
If I am over the top of an overcast I would never consider a handheld as primary nav.
GPS is a PRIMARY tool for navigation. In the airways above FL95 is all we use for primary nav.