I've never used a pee-valve until last week. Unfortunately, I've had nothing but problems with it. The rubber tube that inserts into the condom catheter is leaking between the tube and condom, or it pops out when in use. At first, it was hard to insert the tube into a new condom, but now it seems easy--almost too easy. Am I inserting the tube into the condom wrong or is there a defect with the tube?