Until today… The memory could not be written and the sim closes, whilst loading. What’s going on?
If it happened one time without restarting the system it could be anything.
If you mean “read” instead of “write” here you go:
Issues like that can also be caused by other applications too so try to reproduce that. If your cannot do so something else might have caused trouble (drivers, system components…), so restarting the system might already fix it for you.
WRITTEN is not same as READ 
…There are different reason for that ( as example OC, etc ).
We have existing topics for “written” too, which should be checked:
summary also here:
Topic title altered and moved into Community Support > CTD Help
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