I'm running Pianoteq Stage 8.3.1 on an iPhone 14 Plus ioS 17.5.1 using a Yamaha N1X. Recently, it's started clipping and then not responding after playing for about five minutes. Increasing buffer size (up to 512) helps but doesn't eliminate the problem. It occurs even in undemanding passages such as Hanon exercises. Any thoughts would be much appreciated!