BIMIX Loss of efficacy

[AverageHusband&Dad]

I started BIMIX in late July and have been using the same vials since then and I've noticed the last few times I've used it (past 3 weeks) I've lost my erection about 5 to 7 minutes into intercourse. I use 5 units for a perfect morning session. I used 7 units Sunday morning and i still went soft about 5 or 6 minutes in and had some heavy foreplay to get him back to finish. I'm assuming it's starting to lose potency just sitting in my fridge door since July 30th. Has anyone had experience with BIMIX losing some of it's efficacy over 2-ish months being just refrigerated in the door and never being frozen? My urologist prescribed BIMIX #4 (30/1) and it reads to discard by 10/22/2026.