Need IOS Expert For Our Midi Piano App

We need IOS experts who have good knowledge of Core MiDI & Core Bluetooth. We have a MIDI player App that connects with the piano using a Bluetooth connection. The app transmits MIDI notes from MIDI files to the piano. The issue we are facing is the app's MiDI player skips some of the midi notes while it's playing on the piano. We are started facing this issue only with the latest IOS 14, App perfectly works with the older version of IOS. We are not sure what exactly causes this issue it may be Bluetooth or Core Midi source written​ in the app. Your job is just to fix this skipping node issue. We will provide the app source once you selected for this job. Thanks