Right after the return window closed, this stops working as well. Sometimes I have to feed the envelope through two or three times to get the envelope fully open. I am handicapped with limited use of my hands. I bought this for personal use because I have trouble opening envelopes. I’ve bought the smaller, hand-held ones and they eventually jam up. So I bought this hoping it would be sturdier. I only open two or three envelopes a day and I often have to feed them through more than once. Luckily, I don’t have much else to do during the day, so feeding it through multiple times keeps me busy for a few extra minutes.