This is fairly well known issue with both iPads AND iPhones.
Apple doesn't seem to have a fix or solution for this, as yet!
You are free and welcome to submit feedback about this issue to Apple.
This is only one of the few ways to directly contact Apple about ANY product issues.
iPad Feedback
http://www.apple.com/feedback/ipad.html
Cognizant Apple employees read ALL feedback generated from all of the various feedback pages and transfers the data to the proper and responsible Apple teams and personnel, but NO Apple employees will ever respond with any type of direct, individual replies from the feedback you post.
The more users that post product feedback about any product issue, the faster Apple, in California, is made aware and starts working on a fix/solution for a future software update.
If no one posts feedback to Apple, Apple will have NO clue that there are any types of issues with their hardware or software products!
Also, I suggest contacting/reaching out to Apple Product support and services.
Tap on the first link below and scroll down some to get to the Apple Product Support section and phone numbers for your location/region.
https://www.apple.com/contact/
OR
https://support.apple.com/en-us/HT201232
If you need to, if initial 1st tier Apple customer support is of no help to you, you can calmly ask to have this issue escalated up to more responsible, senior Apple customer support employees to see if they can come up with a possible solution, but I make no guarantees, whatsoever.
Even if no acceptable resolution, Apple, AT LEAST, logs all support calls and issues
Best of Luck to You!