05 s10 gas guage sticks?

i have an 05 s10. the gas guage will read correctly and then randomly it will drop to no fuel and light the low fuel light. then after a few minutes will pop back up to the proper reading? band sending unit? bad wire? where to look?

Could be a bad ground. Strange as it seems my wifes was acting funny and I read somewhere abot adding Techron fuel system cleaner to the gas. I tried it and it worked for hers. Do you feel lucky today?