Machine hangs after running last 2 files

Machine hangs and is unresponsive after running last two files. The files run as expected but will not respond to any input unless rebooted.
here aree the last 5 lines of the G code
G21
G90
GO Z10
GO XO YO
G4 PO.1

Is it possible that the G4 pause command is hanging up the BB.

Hey Tony,

I assume these "O"s should in fact be zeros (“0”):

G0 Z10
G0 X0 Y0
G4 P0.1

G4 – Dwell

G4 P0.1 should be okay (pause for a tenth of a second)

Thanks Aiph, yes, my touch typing is getting bad. For the last 2 yrs the machine has gone to 0 at the end of file, and been controllable with either the keyboard or controller, dunno why it decided to go wonky, and stopped working as normal, unless it was the Harvest Moon.
Been building purpose built vacuum pads & having fun with that, kinda resigned to staying with Easel as this 81 yr old brain is balking at new software but there is lots of interesting ground in workholding.
Cheers.

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