A few clients have reported issues with the iPad Pro solidifying subsequent to charging and not able to react to squeezing the wake or home catches.
Clients are recommending the guilty party is iOS 9.1. Ideally this is the situation since a straightforward programming overhaul to iOS 9.2 can alter the issue.
Apple discharged a short bolster report disclosing how to settle the issue. You have to constrain restart the iPad Pro by holding the rest/wake and home catch together for 10 seconds.