Miix 3 1030 - The battery discharges slowly when adapter is connected

Just as the subject says, the battery level slowly discharges over time even when the adapter is connected while the tablet is running.
But when I turn the tablet off, the battery appears to be charging fine.
This happens all the time, and it doesn't matter if I play a game or if the tablet is just idle with no programs running.
I used to be able to play a game with the adapter connected at the same time without the battery being discharged, so this issue has started recently.
I've tried different charging cables, but same issue.
Bios is up to date (v25).
The folio case keyboard firmware is also up to date (v10).
The windows power settings is set to power saving, and I've tried to decrease the brightness.
I am usually very busy during the day so I might not have time to call the support, so I was hoping that someone here could assist. Any suggestions?

It is actually both the "mains power" and (with some delay) the "battery" icons flickering (the latter sometimes turning red even though it should be blue as per the full charge status. This seems to be due to the plug of the AC-200 power supply /charger shipped with type RX-72 Booklet 3Gs which is NOT making proper contact, being longer than the socket's depth and having all-too-literal radial "wiggle room" (as if of insufficient diameter) at least on the units of several reviewers at http://hukd.mydealz.de/deals/ebay-wow-nokia-booklet-3g-349-euro-versandkostenfrei/8751#un96854 - moreover I have heard one of these netbooks (not just the PSU itself) make a high-pitch hissing sound (as from switching PSU or LED backlight transformer coils) only while the mains charger is plugged into the Booklet 3G. In fact it needs to be firmly plugged in to make contact at all, but it just does not fit tightly into its wider than expected socket - actually whatever little vibrations are caused probably by the slow hard disk suffice to disconnect the plug and drain the battery after a few hours unattended in an empty room. I do very much hope that this is just a problem of the charger rather than an engineering defect in the Booklet itself, and that Nokia will indeed take the opportunity to offer me another one with a better plug to try.

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