[ubuntu-studio-users] Spurious effects

[Ian Fantom]

I have Ubuntu Studio 16.4 installed on an ASUS X550C laptop.

When I write a document in LibreOffice Writer I get all sorts of 
spurious effects, which I initially thought were due to an oversensitive 
mouse pad. I had the problem before upgrading from Ubuntu 14.4.

But now I've been watching my hand movements, and I get the effects when 
my hands are nowhere near the mouse pad.

Suddenly the mouse pointer will jump to a random position in the text, 
and the typing will continue there.

When selecting a text sometimes the text is replaced by a random letter.

This morning the mouse pointer had disappeared when I opened the laptop lid.

The screensave seems to have disappeared.

The icon for my memory stick no longer appears on the left-hand menu 
(DEVICES, PLACES, NETWORK).

Any ideas?

Regards,
Ian