Symbol MC9090G scan guns timing out

We have a plant that uses 14 Symbol MC9090G scan guns to do daily work, shipping, receiving, inventory queries, etc. They use DCLink's trancollector to do their inventory work. They connect to our network via Cisco wireless APs.

Before we upgraded their T1 they were having minor issues of the scan guns timing out when doing scans. TCP COMM time out errors are what they were receiving. Now that we have upgraded their internet to Comcast fiber and they are now getting a 20/20 MB connection back to corporate the scan guns are timing out constantly to the point they are useless. We have adjusted all 6 of their wireless APs to minimize any crosstalk, setting channels correctly, reducing power so they are not crossing over, etc. but we are still having the same issues.

Last night one of the guns worked flawlessly per the user all night and this morning. then they said after they turned on another gun the one that worked flawlessly is now timing out. we have checked all settings trying to figure out if it is still a wireless issue, an issue between the guns, etc but nothing found so far.

any ideas?

thank you in advance,

Buddy