connecting + openBSC initializing problem with nanoBTS 139

Hi there, I'm experiencing a strange problem since a few days - and I already did some resets (with the "dongle") of my nanoBTS 139U DSC1800, running firmware 120a. I cannot connect to the nanoBTS anymore with openBSC. There is an OML-link established quite fast, but then the BTS "disappears" with a socket error. It worked perfectly before, and I did not changed anything in my system so far. When I'm running the ./ipaccess-config 192.168.10.27 (the IP of the nanoBTS) is shows me a lot of information (all fine), but after the last message, the nanoBTS restarts automatically... so connection gets lost and the ipaccess-config program terminates as well. I cannot PING the nanoBTS also after that message. After 30-40s it re-appears of course, same process starts again. ipaccess-find works fine as long as the nanoBTS is in the initializing sequence. Here the content of the message: "<0005> abis_nm.c: 537 0C:BASBAND-TRANSCEIVER(04) INSI=(00,00,ff) Failure Event Report Type=processing failure Severity=warning level failure Probable cause= 03 00 01 Additional Text=835:WARN:OAM_RES:res_trx_status.c#209:TRX is not responding - reinitializing th" Directly after this one, the program terminates with a memory mapping error message back to the console. Any idea? For me it does not sound good... something like a hardware defect - which I really don't want to have now :-/ Best regards from Cologne! Daniel