Same issue with a Taurus PT-745 and....
I sent my Taurus PT-745 back to Taurus and they fixed it. I got a little run-around before I learned from a dealer that it was a bad magazine spring.
My suggestion: Watch the situation carefully and take a notebook and pen to the range with you. Carefully document when it happens- IE:1 of 112 shots, or 1 in 42 shots, etc.
I have also heard on some perfectly good guns, that grip is a factor, especially for small guns and/or big hands. Check your grip- when it happens, instead of taking your hand off the gun to grab the mag, look at your grip. If your shooting hand thumb is over the release, that might be your problem. Another idea for this would be to get some cheap WATER BASED paint at Wal-Mart. Brush a tiny dab onto the magazine release button with a Q-Tip. Shoot 5 rounds. See where the paint has printed your hand. Paint it again. Shoot another 5 rounds. Check the paint location. Do it all again. If the paint is constantly printing on your thumb, it might indicate that this is the issue, or whether this is NOT the issue.
I hope this helps.