Lately, my normally very reliable Interarms PPK/S has had a problem with the saftey lever just dropping down in to the "safe" position when I am firing it at the range. This a new issue; I have had this gun for years and have put several thousand trouble free rounds through it. Any thoughts as to what is causing my safety lever to just drop down and engage itself? This NOT what I want to have happen if I am in need of the gun going bang on subsequent shots!