I've had a similar experience. Post COVID, return to office, I went crazy for the first several months, seeing the full service AMP girls twice a week and sometimes more often. Took several months, but eventually I wore myself out and dropped it down to once a week, max. Since the New Year, I'm back to a once every few weeks schedule. I've also limited the number of spas I visit and the women I see. Most often, I find myself repeating with just a small handful of women I've seen before who I know can get the job done.
I'm in my 60s and I also have an issue finishing with a cover on. Whether it's CBJ or CFS, it's almost impossible for me to finish in the bag. When I'm close, the cover comes off and I either finish in her mouth or with a HJ. In fact, I can only remember one time in the last several months when I could finish from CFS (she had the tightest pussy I can remember and I hadn't cum in almost two weeks prior). Sometimes it even takes me a long time to release with a BBBJ. I ended up extending a session recently to 90 minutes with a provider I'd seen a few times before she could get me to finish with her mouth. Once every couple of sessions I can't finish at all no matter what they try.
I'm generally healthy and fit but I'm on blood pressure medication. I've tried changing medications and my doctor said the issue isn't related to my pills. I went to a urologist and my testosterone levels were good. He couldn't find any physiological reasons for my issues. He called it "delayed ejaculation" and said it can be an issue with older men and may be related to the nerve pathways aging.
For now, my best advice is try limiting the frequency of your visits and only partake when you are well rested and able to mentally engage with your partner. Exhaustion, lack of focus and alcohol are all boner killers and can keep you from arriving at your happy ending.