LIMITED ACCESS | 2504 + 2702 aps

Dear All,
We have a the following issue with a 2504 controller in a data center connected to 20 AP in different offices. We are getting complains about "Limited access" and clients are disconnecting randomly. If they then disconnect and connect to the network it works again until the get limited access again. Sometimes this happens 5 times in 10 minutes and other times they can work for a couple of hours.
Has anyone had a similar issue and able to solve it.

Dear George,
thanks for your reply.
We have done the first suggestion. It was set to 1800 sec. It is now disabled and we will see if this helps on Monday.
Could you explain a bit more what we need to look for on the WLC to see drops. We can ping between the datacenter and all aps without any drops. What is capwap join time?

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