Is the problem location or time sensitive? By "location" I mean that the failures tend to occur when you are in some particular room. By "time" I mean time of day.
I ask because WiFi is extremely sensitive to interference, especially the 2.4GHz band. For example, microwave ovens and DECT telephones run on that band. It could also be related to a neighbor's WiFi. Finally, it could be related to other downloads happening on the home net at the moment you connect. The CC "are you there, calibre?" broadcast messages will be thrown away by the router if it is very busy.
One experiment: change which 2.4GHz WiFi channel your router is using. Some routers have a channel scan feature that searches for the least congested channel.
Another experiment: if it fails, move to very close to the router and try again.
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