Check Engine Light,transmission control module failing. We just replaced the computer module (pcm) 4 days ago?

Check engine light indicates several codes all pointing to transmission module failure..first code reads p0700 all the codes point to the transmission control module failing. We just replaced the computer module (pcm) 4 days ago..i know they are linked for sure could one cause the other to fail? Or a loose connection or something? We just think its odd we just replaced the computer module days ago now the transmission module is failing . Please help.

My car has 107343 miles.
My car has an automatic transmission.