Kontact stops fetching emails upon internet connection loss and doesn't recover. The account type is IMAP with SSL. Kontact version is 4.8.5 (not available in the version list in the bugtracker).

Closing Kontact and opening again doesn't help. It still doesn't fetch emails and the progress 
indicator (progress bar at the right bottom corner) doesn't show up.

It be seen that an akonadi_imap processe is left ofer:
user 22261  9154  1 Oct24 ?        00:19:25 /usr/bin/akonadi_imap_resource --identifier akonadi_imap_resource_0

Stracing the process we can see it is in a cycle of

poll([{fd=3, events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN}, {fd=6, events=POLLIN}, {fd=12, events=POLLIN}], 5, -1) = 1 ([{fd=6, revents=POLLIN}])
read(3, 0xbf812c6c, 16)                 = -1 EAGAIN (Resource temporarily unavailable)
recv(6, "j\0\3\1C\0\0\0\1\0\200\2\1\0\0\0\251\255\7\232\251\255\7\232\10\200\273\277z\32\6\10", 4096, 0) = 32
recv(6, 0x9276f90, 4096, 0)             = -1 EAGAIN (Resource temporarily unavailable)
recv(6, 0x9276f90, 4096, 0)             = -1 EAGAIN (Resource temporarily unavailable)
recv(6, 0x9276f90, 4096, 0)             = -1 EAGAIN (Resource temporarily unavailable)
recv(6, 0x9276f90, 4096, 0)             = -1 EAGAIN (Resource temporarily unavailable)
clock_gettime(CLOCK_MONOTONIC, {3043019, 547303416}) = 0
recv(6, 0x9276f90, 4096, 0)             = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=3, events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN}, {fd=6, events=POLLIN}, {fd=12, events=POLLIN}], 5, -1) = 1 ([{fd=6, revents=POLLIN}])

We can also see with netstat that a connection is still in state ESTABLISHED

tcp        0      0 192.168.1.10:51614      X.Y.W.Z:993        ESTABLISHED 22261/akonadi_imap

Killing the akonadi_imap processes doesn't help: kontact starts up with all the email folders in red characters (see atachment).

Killing ALL akonadi processes solves the problem as Kontact restarts akonadi.

An end user would have to logout / login again to restart receiving emails.

Conclusion: the akonadi backend does not deal with connections interruptions and Kontact does not deal with akonadi's misbehaviour.

Reproducible: Always

Steps to Reproduce:
1. open Kontact and fetch mails
2. loose internet connection
3. observe that Kontact is not fetching emails anymore
Actual Results:  
Kontact stopped fetching emails.

Expected Results:  
Kontact should realize the internet connection is available already and restar working properly.