Replace the battery. They tend to wear out and it depends on the type of battery. I use Surefire but any fresh CR123 works.
Put in a fresh battery and then see how long it takes to wear down. I am attaching my battery replacement record of all my stations I have running on my VP2 for comparison.
OR you can get into a long discussion with people telling you to do all sorts of things, but ultimately , just replace the battery. Things like cloudy days, temperature ranges, and how well the battery was made do affect the life of the battery.
I figure six months in our neck of the woods appears to be about normal.
I buy those batteries in bulk from
https://www.batteryjunction.com/ They are a good source and do not require you to spin straw into gold or sell your first born for a battery.