Like most of the posts here, I've dealt with Sunny Communications for over 20years. I remember when they first started.
They always stood behind their products, and any radio that doesn't pass their tests, are used for parts, if unrepairable.
They don't advertise as being a manufacture certified repair depot
They just buy used radios, typically in bulk from agencies, go through a detailed testing and refurb process, and if necessary, purchase new accessories, to make the radio as complete as possible before they are put up for sale.
I do realize every sale to a customer has different circumstances, but at least allow them to help the end user troubleshoot the radio. I've had to do that a few times with them, and they are very helpful.
To add onto mmckenna's post above, besides checking your antenna, I would check your power supply. I've been in the 2way radio industry for 20 plus years, and have seen numerous times where the power supply might be a little "Soft" and the voltage breaks down enough to exhibit a lower output power than expected.
Alot of variables to consider, before blaming a reseller in general
