Weird problem: Screen flickers when charging below 80%

[The Bachelor]

Acer Aspire 5920 series that was purchased yesterday.

And now there's a weird problem...

When the battery is under 80%, and I plug it to charge, the battery status changes all the time from charging to not charging, and every time it does, the screen flashes... probably because it's going from the low brightness (battery saving profile) to high brightness (ac profile)

And when the battery is charged to over 80% it stays to status 'charging' until 100%.

Thanks in advance for any help/guidance/information.