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Repair case 4657687. 01/20/20223 Pioneer QX-9900 quad receiver

Case 4657687. 01/20/20223
Pioneer QX-9900 quad receiver.Distorted sound after 20 minutes.
Cleaning all front panel switches and control pots solved the problem.
Technical view feedback – nice unit , build to last long time , perfect modules separation for prive nting signal interference between modules, plus each section has own shield cover, multi-voltage transformer let you use this unit in any country around the world without modification , good quality components in use, good heat sink design, stable sound at any power level.
Minuses- hard to get to front panel switches and pots in case if they need replacement.