Comodo 5.12 Transferring excessive amounts in the last couple of days

I have Win XP and Comodo CIS 5.12.256249.2599 with Virus sig db 18166. In the last couple of days, Comodo’s been acting funny and transferring excessive amounts of data, taking 90+% of my Internet connection. What’s going on? It doesn’t usually transfer nearly so much. Yes, I know that virus sig’s not the latest even though I have auto update on real time scan going, but I’ve been getting errors for weeks trying to update it.

PS: I will not upgrade to Comodo 7+, not unless I’m sure it will work well on XP.

Although systems differ, but I have v7.0 installed on WinXp Pro and I’m experiencing no problems. You may want to give it a try.