I had had connection and had used JRemote to play an album by London Grammar, then changed to the Stones. The connection then failed, although the music continued to play. I have connected via Panel and JRemote previously using an access key, but now neither will connect. It is as though the idpi has disappeared - although it was playing ok.
I have also previously connected with vnc, but now it will not, and windows will not find the pi on the network.
I think it may be a network connection problem, and to connect the pi to my computer mouse/keyboard/monitor would require me to switch it off.
I think if it is still problematic tomorrow, I will switch it off and risk the corruption to the sd card as I would have to switch it off anyway in order to connect to my pc.
Will post results tomorrow after I have slept on it.