Switch has 26 ip licenses and 21 working i2004's and 1 i2001. Attempt to add 22nd i2004, comes up and PC connected behind it works perfectly, but phone won't stay up. After awhile, phone loses connection to server and can't locate server...PC still works. Tried 3 different phones, same thing. Rebooted switch and first 22 phones came up, but 23rd couldn't find server...different phone than one with original problem. Any ideas???