I personally came to the same conclusion i think sony must have put some hidden rootkits or malwares in 4.40 they are notorious for doing so, so i wouldn't completely dismiss it, people are now getting banned as soon as they sign in, i think before you sign in it may do a scan of your ps3 to dectect any modfied files, its all automatic now so they no longer need to take time to search and ban you, I've decided to stay off psn, i can't use psn on 3.55 anymore because the sen enabler doesn't work anyway for 3.55, i don't mind using my ofw ps3 for the time being, ps+ gives me enough games to play and i can stay signed in for long periods on ofw.
Till someone comes out with a way to truly stealth the console while online like the xbox 360 i won't be signing into sen for the time being, i suggest other people do the same if you truly value your sen account.
PS3 Slim v3.55.4 CFW Rebug 1TB Internal, External 2TB
XBOX 1 with XBMC
Wii 3.2E + Cfg UsbLoader External 1TB
DS lite & DSiXL + Cyclo ds 8gb micro sd DStwo 16gb micro gd
PS2 V14 legit matrix infinity modchip
PSP slim 2006 5.00 M33-6 8gb memory stick pro duo
PSPgo with 16GB M2 6.60 PRO B10