2000 Taurus won't start, no power

I have a 2000 Ford Taurus which occasionally won't start. It loses all electrical power to everything. No lights, nothing. I wiggle the battery cables, fuses, then it will start for awhile. It will be fine for a couple of weeks, then it will happen again.

Could it be a computer problem?

Any ideas?

i had this problem on a 98 and i just replaced the battery and the connectors and now it runs fine.