So I'm flying my P4 this evening (9/28/16) in an attempt to video the sunset. Nothing great with it just practice for me. At any rate I take the P4 up to 392.4 feet when I get the "Max altitude" message so I release the altitude control and concentrating on getting the subject matter lined up in the camera when the "Max altitude" message starts repeating itself over and over and over. What the heck??? So I glanced at the altitude and it was indicating 560 feet?????? (No I didn't change the max altitude limits) So I immediately start a descent. When the P4 lands it tells me that the altitude is now a -140 feet??? So I'm guessing that something somewhere in the software was a wee bit miscomputed. Anyone else had any similar occurrences? I shut everything down, restarted and everything from that point was normal and I went through 3 battery flights with no more issues.