AICS long action mag falls out?

Mr45auto

Private
Full Member
Minuteman
Jan 3, 2007
58
0
56
Oregon City OR
I have a nice 300 win rifle using Surgeon bottom metal. One of my 3 mags falls out under recoil nearly every shot. These are 5 round AI mags. The other two are just fine and rather than shitcanning an expensive mag I'd like to fix it. Any suggestions? I dont want to sell it and give someone else a troubled mag.