Loss of Integrity on approach. KRNT RNAV 16 Z.

1 minute before the glideslope intercept on this LPV approach things went wonky. The approach wasn't downgraded, it just was cancelled and disappeared from the G3X display. The autopilot went into ROL mode. The logs indicate that I maintained 3d GPS the whole time. About 90 minutes later I flew another flight with LPV approach at an airport 100nm away, and just before intercept should have occurred the LPV was downgraded to an LNAV approach. Update: There were many other reports of GPS approaches being downgraded during the week of this event (Seattle area). All my equipment is/was working fine. I did the same approach at KRNT the next day without any problems. Next time I will know to pick a downgraded approach to get back on track, instead of trying to restart the same LPV approach multiple times. Why it was cancelled instead of downgraded I am not sure. May have to do with when the Loss of Integrity was received.