While vacuuming, debris spits out the back.

How to Fix a Vacuum That Lost Suction - Quick and Dirty Tips

www.quickanddirtytips.com/.../how-to-fix-a-vacuum-that-lost-suction

Oct 3, 2013 - It's true, a vacuum that doesn't have suction is not very useful ... The first and most basic reason a vacuum isn't picking things up off the floor is if the ...The lower your carpet, the closer the dial or lever should be to the bare floor setting. ....it off and shaking the dust off put the power right back in my vacuum!

Common Vacuum Issues - and what you can do to solve them

blog.mchardyvac.com/.../common-vacuum-complaints-what-you-can-do...

Oct 4, 2013 - Your vacuum's job is to pick up dirt, dust and debris - so when it stopsdoing ... Often when your machine is not picking up it is due to loss of suction. If yourvacuum cleaner turns on but won't pick up on carpet or bare floors, ...

Is your vacuum cleaner not picking up dirt and debris ...

https://www.mrright.in/.../is-your-vacuum-cleaner-not-picking-up-dirt-a...

Jan 7, 2015 - But many times it does not pick up or suck the dust as effectively as it is supposed to do. ... If the vacuum cleaner fails to pick up dirt and debris and has no ... Deep clean your expensive carpets to restore their original look.

Some blockage at the pickup or in the hose if it uses one---dirt etc being kicked back out is a clear sign of this----if it has a tube check that first, and if a head with turning brush do not miss looking for a blockage there.

The belt is slipping because something is binding up the brushes.

It sounds like the airducts that lead to your dirt chamber are clogged. The dirt can't get through to the dirt cup so it spits it back out and blows dust everywhere.

if you are using it on any surface that isnt carpet put the height setting knob to the lowest setting it should no longer spit dirt at your legs and feet

the first thing you should do is clean out the container then check the filter if it looks dirty with a lot of dust it probably needs replacing.
check the hoes for dirt that might stick up.if the problem continues it needs a service.

the vacuum is clogged somewhere the brush roller is just kicking stuff around, as it cant get into the suction port

the hose from brush go to the bag need to check for blockage you have to open there hose to clean