on my older laptop a sony pcg-fx140 i thought i had the same problem but actually i didn’t.
for me , i had to wait for a whiule to get from stand-by to full operational mode.
maybe this is the fact again,
personally on my tr2a i never use the standby i go for the hybranation for 2 reasons, power failures which will charge and discharge my battery and through hybernation i cvan unplaug my power suppy go somewhere else plug it in and no charging is occuring.
hope it helps.