OK,
the log looks 'fine'.
I guess that Collector locks up because it ends in an endless loop - trying to log in but failing... At least there are a lot of login-tries in the log.
I guess you don't need to uninstall Collector but just 'force stop' the application. If you tab & hold on the application (app-icon in the drawer) you should get something like 'App-Info'. Here you can force-stop and application. I believe this will at least avoid the re-install.
As for the issue... I mentioned in the beginning that we currently have an issue with some Samsung phones - we nailed it down by now to be an obfuscation problem where licensing itself works fine - but storing the file gets corrupted because of encrypted strings. So we use the serial of the device for storing the file - and the serial seems to get corrupted on same Samsung devices if obfuscation is turned on (which is the case).
At least thats our current analysis.
I BELIEVE a none-Samsung phone should fix the problem for now on your side.
Meanwhile we are working on a fix version for this. We need to verify this a bit more as the analysis is fresh.
But this seems to be the root of the problem. Why it only happens on same devices and why its Samsung specific we don't know at the moment.