Okay this is getting old. Shooting a GPS approach last week into khwd and lost signal right after the final approach fix. Today shooting the GPS approach into KRHV and same thing. Shot the GPS into KLHM and no problem. When on the ground after starting the plane back up after the GPS failure not getting signal again until maybe 5 minutes later. I have had the 530w bench tested, replaced the antenna and new connector on the antenna. Thoughts?