In the last 30 years I've only had two hand guns malfunction. Ruger GP100 Wiley Clapp REVOLVER, and a Sig 1911.
Both when brand new, Rugers cylinder would completely lock up, that was this year. Sig was about 5 yrs ago, a couple last round failure to feeds. Ruger had to go back to Ruger, Sig mysteriously worked itself out after a few hundred rounds, since then the 1911 has had over a thousand rounds through it with no problems, the Ruger a couple hundred.
Last year I put over 20,000 rounds through pistols without a single issue when I was shooting them, both my wife and young son could induce some failure to feeds in polymer guns.
In 30 yrs I've owned and shot....the following with no issues
Sigs, 230, 220, 226, 225, 228, 229, 1911 in 22lr
Glocks, 26, 27, 19, 23, 17, 22, 34 multiples of most of those
Ruger Gp 100s, SP 101, P89, Mk2 and Mk3 22s
Browning Hi Powers
Smith & Wesson M&P 9s and 45s, PC1911
Kimber ultra sapphire
Bersa Thunder 380
Walter PPQ
Dan Wesson Guardian
None of those have ever malfunctioned on me, in 30 yrs of shooting, some of those guns have < 1000 rounds through them some more than 20k....
For me I've not seen any decrease in reliability, but I have seen a decrease in quality control for more minor issues...
I don't do anything extra ordinary, they are cleaned every time they are shot, lubed, and put away until the next time they are shot unless it's been yrs in which case a re lube happens.