I have the EXACT same problem! I've been using Coloplast supplies, which work the best for me, I get a really long wear time out of them, the bags are great, they lock (as in they don't just fall off or blow out while I'm doing anything, or nothing) but I've been in the hospital 3x's in the last 2 months and had not been able to place my order, and all I had was some Hollister bags left over from when I was on their patient assistant program (don't get me wrong, I'm grateful for the free bags that they provided me with while I had no insurance) But the bags and wafers were more trouble than they were worth. The wafers, as great as they were on my skin, the plastic "window" would always crack or break open, causing leakages, or the plastic ring on the flange would just come apart from the back side of the bag and the whole thing would tear apart, bag would fall off, don't even know what to call that one . . . . I've had the ones with the clips at the end, the clips would start to come off (thank God I was wearing a stealth belt) I've used the lock and roll, and had the lock (just Velcro) undo and unroll in bed and if not for me checking regularly it was on the very last roll and I would have had a huge mess.
I have not contacted Hollister, I kinda felt like they were doing me a huge favor giving me free bags for nearly a year till I acquired insurance, the only thing is they would only give 5 flanges and 10 bags a month to get by on, no room for blow outs or errors on their part.
I have been so sick I still have not placed my order with Coloplast which I need to do ASAP, but with Medicare they send you enuf stuff to make it more than enuf in an emergency if needed especially after Hollister!
Maybe this will help, (or make it worse, who knows!!!) just knowing you're not the only one going thru the problem helps, but with enuf of us having the same problems instead of complaining about it here maybe all join together and over load them with letters to get the problem fixed.