I have had my share of networking issues as well. My recommendation is not to rely on the rather feeble wifi of the RPi and instead use a wired connection to a third party wireless bridge that has proper antennae. Also, you should set up the network connection on the RPi to be a static IP address. Don’t use the 5 GHz wifi band, just use a wireless bridge at 2.45 GHz. You don’t need the extra bandwidth for VNC. All of these ideas will get you a more stable connection.

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