I purchased this sound bar yesterday and every hour or 2 it switches functions by itself and i have to keep returning to what f i was on. why is this?

Sounds like it's faulty so you must contact the manufacturer, not something that can be addressed here.

Is it possible to play music from a usb memory stick directly through this soundbar? if it is, what method is used to select the album/track?

Please go to this link for a screen capture of how the MP3 playback order works. It's easier than explaining it in writing https://imgur.com/a/3uM3A

How do I control this from my TV remote?

Sound bar and sub volume also works with a Virgin Media remote. However you have to use your LG sound bar remote to add/decrease the depth of the sub and change functions to USB etc

Recommended uses for product	For televisions
Compatible devices	Soundbars
Subwoofer diameter	15.24 Centimetres
Surround-sound channel configuration	2.1
Colour	Black
Included components	Wireless Subwoofer Remote Control
Product dimensions	7.1D x 95W x 4.7H centimetres
Item weight	6.7 Kilograms
Impedance	4 Ohm
Is waterproof	False
Warranty type	Limited
Maximum range	10 Metres
Number of items	1
Control method	App
Wireless communication technology	Bluetooth
Speaker size	7.1 Centimetres
Power source	Corded Electric
Manufacturer	LG Electronics
Language	English, English, English, English, English
Item model number	SJ3.DGBRLLK
ASIN	B06XGV33ZY

LG SJ3 Soundbar - Black

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