Yes, without bumper I can recreate the problem in low signal areas. With bumper on I have no signal loss regardless of how the phone is held.
I can create the signal loss 100% (less so in strong signal areas which may seem obvious but worth noting. Strong signal=less of an issue when being held) when holding it in my left hand or with a gorilla grip.
I can create the signal loss 100% (less so in strong signal areas which may seem obvious but worth noting. Strong signal=less of an issue when being held) when holding it in my left hand or with a gorilla grip.