I'd dig into why its not seeming to get an IP. (based on it connecting to AP but "no internet" I'm leaning towards that being the root issue)Could be issue with switch as you suggest. Anything change on switches recently? Upgrades? Config changes? As cjoseph said, check your vlans too. Check switch logs too, see any invalid arp errors?
Anything change with your dhcp server? Upgrades? location? uplinks? configs? etc. (if dhcp is working for other clients on other APs on other switches, then thats pointing to the switches providing uplinks for your outdoor APs)
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