Lines are displaying & printing wrong. Old file changes are showing up.

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I trying to find out if I my laptop is incapable or if there is something else going on. We don't use paper space. Each sheet is a separate file. This is the way it has to be done due to requirements. All dwg files are located on a server. Autodesk design suite 2017 is loaded on my laptop.
I am using a Dell laptop for 2D drawings with some Inventor modeling for center of gravity and sheet metal design.
In Autocad 2017 (2D files)
1st problem:
After opening/closing many files, copying, editing my dash lines are displayed and printed as solid lines. When I batch plot files (only one file open) they show as solid lines also. The harder the machine is used the worse it gets.
2nd problem:
At random times OLD changes (deleted & changed) from days/weeks earlier will be present in the file.
Dell Laptop machine specs:
display adapter RAM (2,080,374,784) bytes (not dedicated)
free space 40.41GB
standard disk drive
i7 2.9ghz processor
8gb installed RAM
64bit operating