Screen Share seems to timeout after about 20 minutes

Multiple times in the last few months I have been holding Connect meeting with 2 or 3 participants and after sharing my screen for about 20 minutes the display freezes and the participants can not long see my screen. Stopping and starting the share screen does not make any difference. If another participant shares their screen we can all see it but if the origional participant shares their screen everyone just sees a black screen. The only way to resolve it is to end and restart the meeting.

Has anyone got any idea what might be causing this or seen anything similar?