Same thing here. Scheduled scan is stuck on an audio file (.ogg). Running for 23+ hours.
(Core i7, 4GB, 3TB, CIS version 5.10)
When the AV gets stuck the Comodo Internet Security Helper service (cmdagent.exe) has crashed.
If you have the time and energy please consider filing a bug report in the Bug Reports - CIS
board following the format as described in FORMAT & GUIDE - just COPY/PASTE it!
Reporting of bugs is strictly moderated to make sure Comodo gets clear bug reports. So, please make sure you closely follow protocol. That way your report will certainly be seen by Comodo staff.
Also follow How to determine which file is causing a manual scan to hang
to determine what file was causing the scanner to be hung. Please add this information to your bug report.