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I have been running 184.108.40.206 on a production system for over 6 months with no visible issues. The 220.127.116.11 patch is a special release to fix Apple iOS7 captive portal bypass. Other than that, 18.104.22.168 was pretty stable.
You might consider changing the Guest WLAN session timeout on the advanced page on the WLAN in the WLC to a higher number which may fix your re-authentication issue every 5-10 minutes.
We actually disabled the session timeout. Didn't resolve this problem. We are working with TAC on an engineering build that is suppose to address this issue.
Did you disable the WLC timeout as well? Can you run some debugs on the WLC and reproduce the issue.
If no timeout configure then you are right this might be a bug.
I used to support this product back in Cisco and I do remember a lot of issues with WLC version 7.4.