[PS4] Sims taking forever to to things on custom built house

Product: The Sims 4
Platform:Sony Playstation 4
Which language are you playing the game in? English
How often does the bug occur? Every time (100%)
What expansions, game packs, and stuff packs do you have installed? City Living, Vampires, Vintage Glamour. Perfect Patio, Holiday Celebration.
Steps: How can we find the bug ourselves? Unsure
What happens when the bug occurs? All the sims in the house remain still, or halfway through an action for at least 10mins game time.
What do you expect to see? The selected action to happen as it would in any other part of the game
Have you installed any customization with the game, e.g. Custom Content or Mods? On console - never used.
Did this issue appear after a specific patch or change you made to your system? Yes
Please describe the patch or change you made. I purchased DLC products

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Hi guys, was wondering if you could help me with a problem that has become somewhat of a major headache.

I built a house for my sims on an empty lot & when my sims moved into it, everything was fine, they had no problems navigating the house at all.

However, when I purchased & downloaded the add-ons that I have now (minus the Holiday pack I downloaded that on day one), I encountered a problem that is only getting worse & I really starting to grate on my nerves.

When selecting something to do, or even just leaving them to their autonomy, the sims will stand still, for around 10mins of game time, sometimes longer before starting the action, if they are in the process of an action, say eating, it can take additional time to perform every single eating action.

The game will continue in the process, needs will lower, as an example, I even managed to have one sim wet themselves whilst on the toilet as the whole house seemed to just wait for something.

This only happens on this lot, I have another custom lot in the game, an open air swimming pool made earlier than the house & it performs fine, I also have other custom sims inhabiting the same world & they have no problems in their homes (pre-built with the game).

I have more than half of my PS4's HDD free, so I am confident that it is not a hardware issue.

Any help & advice on this would be greatly appreciated as this problem is slowly getting worse each time I play & it is really starting to drive me nuts.

Thanks.