Hi Deon and group, > Which PacComm TNC are you using ? Oh dear. I made a mistake. sorry about that people. The TNC is actually a MFJ1270B. I mistakenly said Paccomm, which is my home system. It's been working excellently, without a lockup ever. The one giving me these long burst problems is the MFJ unit with the 6pack eprom. Maiko