FYI for the future
Apple software/hardware teams and employees are not here.
Other than supoort community moderators and support staff, we are all just Apple product users here, just like you.
Many of us regular, volunteer community support contributors.
No one who posts here works for Apple.
I think you issues lay with CBS and CW app developers and not Apple.
Apple is not responsible for what happens to other third party apps developers and their apps when using Apple's operating system software.
Maybe you should try contacting the developers of the CBS and CW apps, instead.
Your iPad issues maybe a singular issue to you and your iPads.
We are not seeing any other reports about these specific apps and issues with the latest iOS here in these communities and there are no recent reviews of these two apps with users complaining they are not working under the latest iOS version.
I checked.
How much free data storage space is left on these problem iPads?
iDevice, especially iPads, need to maintain a constant 2-3 GBs of free internal data storage, at a minimum.
You may have to free up data storage space on your iPads.
Do you leave LOTS of apps running in the background app switcher?
You really should quit a good amount of background apps, if you do this.
I use an iPad Pro, as well, and find that keeping apps and active Website tabs to a reasonable minimum, makes my iPad Pro run so much smoother than when it loaded up with background apps and other active processes.
If Background App Refresh is still toggled ON in the Settings app, apps in the background are still working recieving data.
Do you leave lots a active Website tabs open in a Web browser?
Again, if Background App Refresh is still active in the Settings apps, the Web browser is still constantly updating its data in the background while not using the Web browser.
Toggle OFF Background App Refresh in the Settings apps.
Here are other optimisations I do to ALL of my iPads, even my iPad Pro.
Tap on the link below to my iDevice/iOS performance/optimisation user tips link.
Slow iPad on iOS 9, 10 or 11! - Apple Community
Try all of these tips and leave each tip active together. Do not simply try every tip individually, expecting just one tip to be a performance “cure all”.
Many of these tips are designed to work together to help improve overall iOS/iDevice performance.