BIGLESA

When flying the PMDG T7, in flight it appears to becomes unstable and begins shaking/rocking/bouncing at high altitudes. Most recent example is followed steps in tutorial 1 exactly. Upon departure and reaching about FL 280 and speed of 260 the aircraft begins the shaking/rocking/bouncing. The shaking/rocking/bouncing behaves the same as when the aircraft is stalling. Upon reaching FL380 I must reduce speed manually to 235 or the aircraft will not stop shaking/rocking/bouncing. I have attempted to uninstall and reinstall the software but it appears to be in the registry and therefore whatever is causing the issues is still embedded in the PC. I am curious if this is happening to others or if this is an isolated event? Any support in attempting to ressolve this would be greatly appreciated.

Loaded T7/Emirates, during tutorial flight follow procedures and flight Is excellent and aircraft flies straight along FP. However aircraft begins to bounce/shake/rock uncontrollably upon reaching flight level 260 and above speed 260. Have tried various options to eliminate this issue. Is anyone else having this problem?