Fenix PD31 issue

I have this light and really like it. Last week I had it in my pocket and it was on and got hot (not hot enough to handle) I took the batteries out of it ans let it cool off. I put it back together and now all I get is strobe and high (actually higher than the low-med-high modes I had before) kind of like a turbo mode. I no longer have the low-med-high modes.

Any ideas??

Thanks,
Paul

Have you tried changing modes while the head is loosened slightly? On my PD31, when the head is tightened, I get Turbo and Strobe. When it's loosened slightly, I get Low-Med-High-SOS.