Last night I had to position my mount slightly further away from the house which meant that my wifi connection from my laptop running Kstars and INDI on the Pi was not strong.
I lost connection a few times and focussing was impossible (too long required for the download).

I had an old Airport Express (mini router/Access point) which I have now connected directly to the Pi with a cable. Seems to have solved my wireless woes.
I think the Pi wireless access point is very weak and only really seems to work if you are within a couple of metres.