There is no difference between amps made pre July 15 and post July 15 - Topping.
Sure 10 people in a group chat had broken amps.
How many of those amps has Topping sold?
What is the usual failure rate of manufactured electronics like amplifiers?
Your figure is useless
This is the situation: A known issue that can arise is popping which can be fixed by a module replacement.
Some guy got three (3) REPLACEMENTS before he didn't need another...
Since Topping knows what the issue is, and they fixed his amp, shouldn't it be impossible to need three?