Hello Paul G
Could be you are being under, or over powered?...LOL.
But seriously...Think about power surges, PSU being weak?, Power surge bar being taxed?, Brown outs when the heating comes on?, or you are doing laundry?, or the old Fridge and freezer kicks on?...all at the same time?, or here and there, when you are mixing and mashing things in Sonar?.
Some times the little things Get over looked...and some line noise on electrical can cause issues as well...
Just saying I found that out last night...but had it in mind to redo the electrical , and move all 220 lines to a new service line and electrical box....Because Just making electrical runs from the box exclusive for my Studio, does not eliminate the surges of the house...and the Power surge bar I use, is not sufficiently reducing those spikes, or drops in voltages.
Second.
Marvell 91xx controllers on some motherboards are buggy.
Might want to google that.
Third
The one I Like most, is get yourself a favorite beverage, and some munchies..and do a good read up on things here in the forums .
I believe some people posted missing tracks/corruption of project files, when saving...I know I have....Wink.
Yes run a virus check..
Four
Do the math, and add up the voltages of your devices in the system and that connected to the system.(including usb/firewire/add on cards)..and make sure your power supply is over specified for them...
Try turning off the heating system, and house hold electrical hogs that start and stop natively in house.
Just to be safer than sorry...while this is being routed...Save your files to a few mediums...check The Data through MY COMPUTER , before closing Sonar, to make sure your data is counted as more than Zero.
And some times just to make sure...there is a box you can tick when saving, to save all audio with the CWP file.
So you can make backups...
I think that is the first rule of computers...But if the OS or Software or Hardware is not doing that right...it seems pointless!
Just trying to help...more mead is needed all around the table!
Cheers!