[Plextalk] CHARGING PLEXTALK POCKETS

?I have two Plextalk Pocket PTP1 units and a Linio. All three units have developed the same fault over time, and that is that they will not charge using the mains adaptor. There is definitely power going to the units, but they will not charge. Because of this I have now started to charge these units via a USB connection, either to a computer or listening device which has a USB charging facility, and everything is working fine. Has anyone else had this problem? It has been a concern of mine for some time, especially as it affects all three units, but at least I have found a way round it. All my units are now fully charged, and using the USB facility seems to be much more reliable than using the mains. Keep well. Peter