I noticed a while back when the shields were rebalanced to transfer damage that sometimes the recharge bar flickered after shields went down. Last week, I got the details straightened out and I just got a replay put together showing what is happening.
-> If you have 2 shields that overlap, the shield that actually takes the hit transfers 15% damage to the second shield.
-> If a shield takes damage while it is recharging, there is a three second stall till it starts recharging again.
-> Recharge time is faster and does not ever stall when the shield has actually gone down.
The above are no brainer details, but that is the setup for the bug. Here is a description of what is happening in the replay. This is true of all factions, and gets significantly worse under more fire.
Item #1, south side --- a single t2 shield that has units in front to take fire. 1 enemy PD spawned.
Item #2, north side --- same as above, but with a t3 shield lapped over the first shield structure and target. 1 enemy PD spawned.
When the #1 shield takes fire, obviously it goes down and recharges as normal. When # 2 shield goes down, the T3 shield takes fire while it recharges. What you will notice is this. Every time the t3 shield takes a hit as the t2 is recharging, it transfers damage to the (nonexistent) t2 bubble, which stalls the recharge for a split second during the bar flash EVEN THOUGH the t2 should be in full fast recharge with no stall. This adds up every time the shield goes down, until by the end of the replay the #2 shield is almost a full cycle behind the #1 shield due to the recharge stalls.
As you can see, there is not too much effect under 1 pd fire and there is one stall per 1.5 seconds. This does become a MAJOR problem given a situation where you have an array of 4 shields taking fire from say 5 cybran destroyers. The shields are taking a hit several times a second. This means that the stall period causes your shields to go down one by one without letting ANY of them recharge until there are no more bubbles to transfer damage. Basically, all your shields have to go down for any of them to recharge, and at that point the fire on your base will kill everything.