TS3992 Am trying to do an initial backup however after 4 or 5 hours it keeps dropping wifi.The computer is next to it and not dropping out.Thanks

I once again am trying to do initial backup after correcting from a previos email adress.After 4 to 5 hours it keeps dropping the wifi and does not start again automaticly.Computer is also on wifi and seems ok.Tho longer its on the more often it does it.Thanks

The backup file size is 1.67 TB.*
That's across the internal bus of a 2009 quad-core Mac Pro - which is pretty fast.
Copying an hour's worth of MPEG-2 HD takes about a minute.
I do a fresh backup from scratch about once a year, and the last time it finished over night.
This time the first Time Machine backup is only about 1/5 complete after many days, and Activity Monitor shows essentially no use of disk drives or of CPU.  And in the first note I pointed out what is gleaned by using Terminal to execute the UNIX ps command. The priority of the running Time Machine process looks incorrect to me. 
I could be wrong, but I think the problem is process priority, not file size.
I am unable to set priority to 0 or a negative number.  Can someone straighten me out on how to do that?
[*The machine has four 1.5 TB disk drives in it plus lots of memory.  Two of the physical drives are configured as one 3 TB backup drive (RAID concatanated).]

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