Back button works weirdly in Local Repo

Steps to reproduce:

Kill the app from memory (swipe it in the recent apps list)
Enter F-Droid and the Local Repo activity
Disable the local repo by unticking the tick box at the top
Press back: Nothing happens
Press back again: Hangs for a few seconds

Those few seconds are sometimes longer and can get the app to get an App-Not-Responding (ANR) dialog.

Logcat shows nothing.

Possibly related, F-Droid sometimes crashes when tinkering with local repos with jmdns enabled. Haven't been able to reproduce it yet:

java.lang.IllegalStateException: A service information can only be registered with a single instamce of JmDNS.
    at javax.jmdns.impl.JmDNSImpl.registerService(JmDNSImpl.java:1005)
    at org.fdroid.fdroid.localrepo.LocalRepoService$5.run(LocalRepoService.java:239)

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