Well let's try fixing this.
So here are a few things you can try:
You can always try defragmenting your hard drive first just incase, plus it'll improve load times for your programs if their data is scattered like dust in a hurricane.
Now since you determined the problem is with tower unite you're gonna wanna load up the windows memory diagnostics tool (this is because if the problem is tied to windows in anyway then it should be able to find it and fix it for you, saving you lots of time), so close all programs you are running and go into your search field and type in "mdsched.exe" and click on the result, then just click the button that says "restart now and check for problems".
Windows will then perform a restart and boot into the diagnostics tool, i recommend you set it to do an extended search to make sure it checks everything it can, just let the default pass amount stay at what it is, and then you just let it run its course.
So if that didnt detect any problems then we atleast know the problem most likely isn't tied to our operating system, which is a plus since that could easily turn into a bigger issue.
So now lets try fixing stuff that tower unite actively use.
First let's try updating the software that your CPU and GPU runs on incase it's out of date.
For your CPU:
Then you can download an automatic detector from amd to automatically find the software for your cpu, or you can do a custom search and find it yourself but the automatic detect is much easier.
After finding the software update needed
For your GPU:
Just go in here and select the operating system you are running on and then download the latest update for it, then install it.
Now lets head into steam and make it verify that tower unite doesn't have a corrupt file or something by verifying the game cache.
That's really all there is to do based on the information you gave us, unless you wanna download third-party software to monitor to what categories the RAM is allocated to when the usage ramps up and what exactly tower unite is doing when it runs the mediaplayer or tries to load the plaza and what step that triggers said RAM usage.