Upgrading is the best policy but we would need more than that I think:
- What type of authentication are you using
- The laptops that had the issue were they on 2.4Ghz or 5Ghz
- When you said failed to connect first 1-2 attempts was that for the WiFI or Authentication?
- Had the laptops configured proxies (that would influence based on the authentication type)
I would suggest when these meetings occur to enable debugging on the iAP and export logs to a syslog. With that information if we are not able to help you I’m sure Aruba support will.
FYI: I have a Windows 8 laptop and I never had issues with connection to 105.