Always check peep sight for burrs sharp edges etc...even plastic can cut
Never have had a problem with the G5...HOWEVER...
When shooters adjust peep while tuning bow...many don't use a press...now the peep is sandwiched between the strings under extreme force at higher bow weights...moving the peep without pressing or tuning down bow weight may cause damage...this applies to all peeps...
a smooth round wedge like a thick pencil on either side of pencil that is slightly bigger than peep will help but...
the safest way to adjust peep is relax string in bow press and adjust...
Neil