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Limited rewind function of dvr? Huh? Why???

I have been watching two tv shows on two different networks, and going back and forth.  Then I tried to back up one to see what I missed, only to discover that the dvr won't allow me to back up?  Is this normal operation for a Cox router?  I have been with two other cable providers, and their dvr has never had an issue backing up, unless a show is being recorded.