Originally Posted by SiempreTuna
Lots of phones these days are moving to higher power chargers to minimise the charge time - e.g. my Nexus 4. Might be worth checking that any charger you use is rated for more than the standard 1 Amp.
+1 - I upgraded my vehicle charger just for this reason! And it's also why I hate generic wall chargers - They usually won't charge fast enough to keep me untethered fast enough.