Comfort Inn's wi-fi network has "issues" to say the least.
On a recent cross-country trip I found that most (all?) of them only allowed for one "PC" per room to be connected to their wi-fi network, easily gotten around by entering different rooms numbers for the username since they use the exact same password for every room account (silly, silly, silly...).
On a recent stay in Pigeon Forge, TN I found my Macbook Pro refused to connect at all to anything in the area while my N800 found - and connected to - wi-fi networks all over the place. Strange.
I'm thinking you're in "crowded" areas and the hotspots are probably at their peak load and that's why you can't get an IP. If an access point's DHCP server has a long lease time and is prone to periods of heavy use from drifters then it might have served out all the IP addresses it's allowed to use. Usually a router reboot will solve that problem, but not always. I've seen some routers in public hotspots have a lease time of "indefinite" which ALWAYS winds up locking up the router over time requiring a reboot.
I usually just hack my way into the AP/router and "fix" it for them.
You have to remember that the lowest-common-denominator in the IT world (read: sub-contractors) probably set these things up and probably the only configuration they did was to change the default login/password to the admin interface, if that.