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Connectivity Issues on ZoneFlex r300 series not sure what else to do

New Contributor II

Recently we started having issues with 1 access point in particular.  We have 3 sites with around 35 access points total.  At the site I'm having issues there are 6 points.  All but one seem to be working as normal without major issues.  This specific access point allows individuals to join the network but will repeatedly drop their connection with about 5-10 second delay and then reconnect them.  Some of the tests the students take here are not cached and it's causing them to have to log out and start over. 

Things I have done:

1) Replaced access point with a good/known working access point

2) replaced cable ends on both the switch it's connected to and the end connected to the access point.

3) Moved the access point to a different switch (there were 4 access points on this switch to begin with, I just did this last night so results are pending).

4) Looking at the access point I noticed a high rf pollution.  All other access points are around 11-20 this one was at 60.  Not sure if this is an issue or not but assuming that rf would be radio frequency and could be causing interference?

5) I've attempted to look through the zone director logs, but with so many access points it's a bit of a needle in a hay stack on trying to find any useful information.

I guess my question is what would normally cause drops of connectivity?  I expect a few drops here and there are normal.  But this is a daily occurrence that is much worse then any other spot.  It seems to happen at random.  5 students might get booted off, get reconnected then 3 might get kicked off, reconnecting etc.  No real pattern that I can find.  It's never been 100% down for everyone at any given time. 

I've tried reading forums, articles etc and haven't found anything that has helped.  Where should I start in my troubleshooting?  Thank you in advance for any and all suggestions.