Hello Don -
I have a DJ-G7 and the similar radio, the DJ-G29. I like them both very much.
One of them eventually had poor battery life after about two years of SOTA use, and I purchased two new batteries (on sale!). So I’d say you also have a failing battery, similar to my experience. Replacement is likely your best option - or you could connect it to a 12V battery and run with it that way.
73, Etienne-K7ATN