I assume this would not be a very difficult fix, but I have noticed that players with maxed out initial stamina ratings tend to fall off in the offseason, but seem to be unable to regain the lost stamina even with 20 minutes of conditioning practice or more.  

A case in point is James Melanson.  Melanson had an 89 initial rating with the low/low message on his scouting report.  I recall him getting to a 90 stamina rating and 11 durability, initially 8 with a regular low report, during his redshirt freshman year.  However, each season since then, he has a 3 or 4 point stamina drop, but no recovery.  I have been practicing conditioning enough to improve his Speed by 23 points so far, but his Stamina is down to 83 this year while the "player thoughts..." email for the first time did not list his stamina potential as low.

This fix should be included in the next update.  I cannot think of any reason why Melanson should not have recovered from 83 up to at least 88 or 89 by now.

you should send a ticket on this I think