i have had trouble in the past with Radarbox not closing. Especially if its been ruuning for sometime. I also notice that at the sametime the database update fails. On closing the radarbox software doesn't completely close.
If you look in task manager you see that the radarbox process brings the cpu usage upto 100%. If I end the process within task manager. The process closes and the CPU level goes back to normal. I then restart radarbox and find any amendments I have made haven't been kept. So I typically make the amendments again update the database and restart the app.
This is just a workaround. If you restart and update regularly then you probably won't see this "feature". I leave mine on 24/7 always just in case something comes over, The odd B-52 etc ;-)
HTH
Graham