This is usually a call for attention. Turn on a lamp with a red light bulb in it. This usually helps. It sounds a lot like a small motor shorting out. It means leave me alone or I'll kill you.
Glider do like to have toys.
A parrot swing, or other climbing toys make great fun for them. Glider Safe wheels like the Wodent Wheel are well received. They also love their pouches. Use these to take them anywhere you go. It can be a lot of fun.