African dwarf frog keeps floating up

I have a quick question similar to this. So my ADF was perfectly normal a day ago, but I have woken up to it floating. I tried to nudge it to see if anything was wrong and it swam just fine, but it was still afloat. So I tried to see if he could sink down, so I pushed him down a bit and he just floated back up, as if against his will. So I was wondering if something is wrong, like if he has a disease or if he is dying. I have looked at many other websites to figure this out but none of them give any specific information. So could anybody tell me what is happening?
 
Are you aware this thread was started in 2007?
 
Still won't stop me from asking though. But he already died so I don't see the point now...
 
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