Window module troubleshooting

Hi all... and for my first post I give you... sigh... another window module issue...

About 8 months ago, I had a Compustar alarm/starter installed on my vehicle (2002 Hyundai Elantra). I had the optional window roll up/down modules installed as well. Typical "alarm arms, windows up, #3 on key fob to vent" setup.

A few months ago, I armed my alarm and the windows didn't go up. I disarmed and got inside, and found that I couldn't manually control either window with the switches.  A few hours later the windows worked. The issue became more frequent on both rolling up or rolling down, until 1 day I couldn't roll the windows up for like a week. A trip to the install shop and their troubleshoot found nothing. They reprogrammed the brain and the windows worked. I drove home, couldn't get the windows up again. Two more trips later, the shop feels the issue is related to some module or something. I disagree, I think it's a wiring issue, but the tech assures me it is not (I am a true novice fyi).

Heres the weird thing though...More often then not, when my windows are stuck down, if I crack the driver side door open a few inches, the switches work until I shut the door again.

So, my windows have been down now for like 3 weeks waiting for the "part" to come in, so I am going to start troubleshooting this myself. 1 thing really confuses me though... Assuming it is not a wiring issue, what else in the alarm install could possibly remove the control from the door switches? I assumed all connections just tapped into lines.