Satellite P10 switching randomly between Battery and AC

I have a satellite P10 that's been having some strange power issues for about a year now.
My laptop will switch over to battery power even when plugged in. I will then either use the computer until the battery drains and have it shut down or hibernate before the battery will charge.
I thought I had fixed it by downloading and installing a new Bios from the toshiba website, which seemed to work for a while but now it the problem seems to have returned.
I have also bought a new battery and power bar, thinking this was the problem...but this did not solve the problem.
Anyone else out there with similar problems or a method of fixing this?
any thoughts would be great.

Hi Greg,
I suffered this phenomenon on my SA30-141, and by trial and error I found it to be a poor contact between the AC socket on the notebook and the AC plug on the adapter cable. Using the technique that Dennis described I tried waggling the power plug when it was connected and found that I could induce the notebook to switch to battery power following which it would not return to AC power without a complete re-boot.
I resolved this problem by anchoring the AC cable to the back of the notebook with a small strip of plastic wrapped around the cable and then clamped to one of the nuts on the back panel of the notebook with a spare bolt. This stopped any lateral movement of the AC plug when it was connected even if the notebook was moved about.
regards,

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