Hi, my phone is behaving a bit oddly and I'm wondering if anyone out there can offer an explanation. I've posted this on the 2 Degrees forum because that's my cellular provider, but if the thread belongs on another forum, mods please move it.

I'm using a Motorola RAZR M, about 2 years old, on 2 Degrees prepaid. At my house in the Marlborough Sounds, it struggles to get any reception and normally tops out at 1-2 bars (roaming to Vodafone). That's no fault of the phone; most cellphones do not get any reception at all around the house. In any event, if I don't plug the phone in overnight, its battery will drop about one-third of its stored energy by morning.

In Nelson it gets better reception (doesn't roam to VF) but its battery behaves similarly to how it does in the Sounds.

In Auckland, even if I start at the end of the evening with a full battery, if it's not plugged in overnight, it tends to be either completely dead or at best at <15% battery capacity by morning. Reception is not flash in this apartment - 1-2 bars - but it's steady and works fine for both phoning and tethering over 2 Degrees 4G.

Tethering is OFF overnight so that's not what's depleting the battery. WiFi is generally off in Auckland; certainly off overnight.

At my place of work in Auckland I've got 4 bars reception but even there, the phone seems to chew through its battery at a rate of knots - and it seems to get warmer than normal.

I thought perhaps the Textra txt management app I had recently downloaded was doing something odd so I uninstalled it, but that's made no difference.

I wondered whether the battery was reaching the end of its life, but the phone continues to behave well when it's in Nelson or the Sounds.

The OS is Jellybean. The phone doesn't think any updates are available, even though Jellybean is quite old.

Any suggestions?