Check you navi cust, to make sure.
1) All solid programs are on the command line.
2) No plus parts (usually atk+1, and hp+100 etc.).
3) No navi cust pieces of the same color.
4) You have only four different colored navi cust pieces.
5) No pieces are overlapped outside the navi cust window.
There are many different bugs that can happen because of that. They can drain your health buring battle, during the chip select screen, make you move like your on ice w/o float shoes, or not in spout cross, I think one cause to crack panels, and turn panels into poison panels(but that maybe a different game). Also there is one that changes the emotion of megaman from normal to Anxious, to Full Synchro, to Rage. I don't know how, because I try to have a bug-free navi cust.