Read the statement by Michael Teeuw here.
my mirror freezes!
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 But there is one suspect thing. 
 When the Mirror freeze, im not able to connect with VNC. But how affect the MM Software the VNC Connection? Maybe there is a Problem with WLAN Connection…?!
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 so continue to disable modules one by one… and default too … to discover the responsible module 
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 @mr_cd : yes but it will not freeze… just display warning 
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 @mr_cd how much swap space do you have? and is used? free -m will show info 
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 @sdetweil  
 if the mirror is running.But lets define the word freeze : I mean the clock is still working - but the modules like wheather or calender ar not updating… 
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 @mr_cd but u also said vnc doesn’t work. 
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 @mr_cd clock is working from internal timer… others require internet connection to update 
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 @sdetweil correct. But when i plug in the USB mouse into rasperry iam able to work. After rebooting the system it works every time without problem 
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 @mr_cd so, not really a ‘freeze’… MM stops working… system is ok, except for networking, recovers on reboot… sounds like network went to sleep. there is a powersave setting on wifi… 
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 seems to be ok… 

