Low volume when using external speakers

When I connect speakers to my laptop the volume is initially high but then reduces automatically within a few seconds.

My laptop is a TOSHIBA Satellite L50-C-1FQ

This is problematic because even if I increase my volume to 100%, I still only get 3 bars maximum when I connect speakers as per the 2nd image attached. How can I prevent this?

Thanks

Exactly what type of speakers are you using? Are they "computer" speakers or something else?

It does it with different speakers and headphones alike, anything connected via the 3.5 mm audio jack

Try refreshing the sound driver. Go to the Device Manager, RIGHT click on the entry for the sound and then LEFT click Uninstall. DO NOT uninstall the drivers. Restart the PC and when Windows starts it will detect and reinstall the sound.

If this does not fix it, I would suspect a hardware problem.

With Notebooks/Laptops I always have to keep in mind that there's 2 volume controls, one is hardware with the Fn and another Fx key combination plus the Operating System control. Add in external speakers and there are now 3 controls to deal with. Sometimes there's a fourth setting depending upon other software for the sound feature being installed.