Please, i dont know anymore what to do...

Firebird = 1.0.2.987
Windows NT

My Firebird Server, just is restarting... when i have more that
20.. or 60.. or 90 conections the Guardian give me a message:

"Abnormal Termination"

Each 10 minutes is a new restart, i have my server running for 1 year
and this begin to hapen now... i change the machine and the database,
and hapen the same... so is not hardware problems. Someone please
give me a awnser.