My platform locks down

 
I have had this problem a couple of times. I leave and EA running on metatrader 4.0 build 215 and it locks down and stops processing orders. In order for it to restart i have to close down the platform and open it again and it resumes activities. What could be causing this problem or is it a bug on the metatrader platform and or the brokers servers? Im using Interbankfx. Any ideas or suggestions greatly appreciated.
 
I don't see your EA.
Reason: