Weird UI lag on PS4

[runeasgar]

I'm trying to ascertain what kind of lag I am experiencing: PS4 graphic lag, local internet/network lag, server network lag, or my pet theory, some kind of PS4 controller lag. It happens for a span of 30s - 3m at a time, maybe at 15 minute intervals. I notice it the most in dungeons (when the life of my party depends on my healing), but it does not solely occur in dungeons. I don't notice it on any other games.

When this lag occurs, actions I take on the controller:

1. May not be registered at all.
2. May be registered with a delay.
3. May be registered numerous times.

Here are examples of each:

1. I click my button for "Cure" and nothing happens. Not at that moment, or at any point in the future (insofar as I have waited). Or, I might click R2 on my controller, and it doesn't even bring up my R2 hotbar.

2. I click my button for "Cure", and it happens, but with significant (.5s - 3s) delay. Or, I use the right analog stick to change camera angle, and it is very delayed. This also happens with left analog stick movement.

3. I have my teleport menu open, and press d-pad down, but instead of going down once, it goes down several times. This is true of virtually any UI that uses the d-pad to navigate.

Any information regarding what kind of lag this is, or how to resolve it, is appreciated.

A bit of additional info that may be helpful:
* I have an excellent connection, with an excellent router. I never have any issues out of it.
* I am not referring to any macro buttons when I talk about this lag; I am aware they have their own "delay".
* The PS4 is wireless. If wiring it might solve this problem, I can adjust the networking behind my TV.
* I do have my PS4 networking MTU set to 1473 in the aftermath of the PSN outage.