[acshortt5]

Possibly could be the electrical part of the ignition switch.

While the engine is running try gently moving the key in the ignition one way then the other to see if it creates/solves issues.

Also check the connections on the battery, particularly the secondary positive connector (has a group of smaller wires joined together that go from the battery connector to the fuse box near the cabin filter).

Check the earth points as well, particularly the main one in front of the battery.