I have had the same problem since I upgraded to POS 18. I use windows 7. I believe my problem is that I have to use 32bit instead of 64 which allows less then 4 Megs of RAM to be used. I was on the support number for over a half hour before I was hung up on during putting me on hold. May want to check available ram? Also of note is that my system reverted to an older version during one of the restarts. Good luck.
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