PDQ Inventory locking out AD account

Hi All, 

I work for a very large company, we have a couple of hundred DC's over the world all on the same domain. In PDQ I have configured inventory to only scan inside our OU and set it to exclude scanning outside of our OU. all this works great.

However, it appears that every time PDQ scans the network the account gets locked out halfway through. I dont know the reason why this is happening but the only thing I can think of is that it is hitting multiple DC's. in a similar application I use (AD Tidy) I can select which DC to use when carrying out instructions. is there a similar facility in PDQ so that i can avoid the multiple lockout events?