Hi Kathi and welcome to the community and the forum!
Is the phone still under guarantee (less than 2 years)? If so, you might be well advised to get in touch with support anyway.
This may not be directly caused by a wifi problem, it could be all sorts of things unfortunately, so we’ll begin with a list of frequent causes. Take them one at a time.
- Do you experience these problems at all locations or only when you’re at home?
- Have you tried a start in Safe Mode and what are the results?
- Do you have a SD card? If so, how is it formatted (internal or external memory)? If internal, don’t take any action yet, before discussing it.
- Which connectivity services do you use regularly (Wifi, Data, Bluetooth, USB)? Try turning off services that you’re not actually using - again, one at a time.
In this regard, can you confirm that you have no problems at all (say an entire day) if you turn off Wifi and just use Data? - Is there a particular app, or set of circumstances, when the freezes are more likely to occur?
- There are known problems for the FP3 with Fritz!box routers. See this post. If the idea of setting the channel manually doesn’t appeal to you we can probably find a way of helping.
That’ll do for a start.
It might be a good idea to find a #fairphoneangel in your area who could help. Let us know if there are any near you.