FP2 reboots in certain wifi networks

Help Fairphone 2
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Yes, there is - but it’s actually more work as usual with the remaining 5% to finish.
Since we now know it has something to do with your 2,4GHz wifi a deeper investigation
would be useful.
The more simple steps first would be followed by the more technical and complex tasks.

  1. Restart your router once (one power cycle) and wait until everything is up and running again (may take up to 5 mins.)
  2. Get a free network analyzing tool like e.g. net analyzer (lite) from the Google play store
  3. Use the (easy to use) tool and provide us with some more basic info such as:

  • Which type of network encryption are you using, tkip; ccmp or the latest wpa2 (AES) ? (recommended)

  • Which network ̶p̶̶r̶̶o̶̶t̶̶o̶̶c̶̶o̶̶l̶ band are you using (should rely to the 802.11??? wifi standard)
    (in your router config)
    802.11n (ok)
    802.11g (ok)
    802.11n+g (ok)
    802.11n+g+b (troublesome)

Read the wiki here:

11b-wifi
11b-wifi1567×127 13 KB

Make sure this mode b is not active, change the mode if actually set in your router.
It could only affect your mobile and not the bitten fruits :wink: as there probably are
chipset/driver differences.

  • Is your network ssid hidden or publicly presented so it can be seen by others?
    I had devices having troubles to reconnect to a hidden network after being properly registered to its unhidden ssid.

  • If there was no hit yet try to take some snapshots of this net analyzer tool (power
    button+volume down).
    Here we can see the signal reception strength, channel usage and overlap with other devices, connection speed to your router, encryption mode set etc.

looks like: (clear sensitive pieces of information using an image manipulation tool e.g. m$-paint/gimp)

net_analyzer-snap
net_analyzer-snap3350×1951 552 KB

or

  1. Clear the (2,4GHz) registration on your FP2 + the device from the list of permitted devices in your APs wifi list.
  2. Re-register the FP2 again (2,4GHz) taking the above mentioned into account and see if things are better (maybe this guide can assist you)
  3. If not check if a firmware update for your router is available to fix an issue

Any more rigorous steps like resetting and reconfiguring your router etc. are quite extensive and would also affect other devices using the router.

  1. If nothing helps - perform a Guru meditation session and remain on 5GHz smiley
    .
    .
    .
    Any other ideas what could be done to nail this cause (without replacing the hardware)?
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