I-140 and moving to Canada

[sbr38]

I used to work for a company X in City A. They filed for my perm and my I-140, and both of them got approved with a priority date of Feb 2012.
Two years ago I internally moved to another City B with the same company X and they filed for my Perm which got approved (they have not applied for my I140 yet).
I am planning to move to Canada in the next couple of months without applying for the I-140.
My question is will that cause a problem with the priority date in case in the future I plan to come back to USA.

SUMMARY:
Approved perm and I140 for location A - same company
Approved perm and I-140 not applied for location B - same company
I move to Canada, will that cause an issue with my priority date in case I plan to come back in the future.