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The fact that it worked well in the first place you stayed - especially if you have not let it get heated up, have cushioned it against any shocks or not subjected it to any shocks, etc. - is a very good indication, that your camera is not 'broken' at all.
I rather suspect, that it has no Wireless-N capability. The last place you stayed was probably Wireless-G-compatible.
(To explain: antique wireless used a slower system called Wireless-B. Relatively modern wireless started using a faster system called Wireless-G. And the most modern uses Wireless-N, which is even faster.)
Check with the hotel, or support staff, and see whether your local wireless access is Wireless-N (and not Wireless-G.)
Do you mean that you have to set the wireless passphrase on your Canon S120?
Would you be willing to consider a factory reset of its settings? that might be necessary if the wireless passphrase has been locked off somehow.
If so, that is
right-arrow to Tools tab
scroll down to Reset All
Press FUNC SET.
Note: this will erase all settings / configurations individual to you that have been put onto the camera.
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