Panasonic vacuum cleaner Model MC-E852

Most vacuums have plastic tabs and a plastic mechanism of some sort to that will engage those tabs to make it stay upright.
I am suggesting either the tabs are worn down, or are broken off, or maybe the locking mechanism is broken.
These parts are most often not replaceable, unless you can find an identical machine with these still good on it, and swap whatever parts are necessary to fix it.
Machine is a "throwaway " model.
When it breaks, you are expected to buy a new one.
God bless your efforts.

Set the on/off switch to off, now check near the top of the "beater" portion, I think that model has a reset button, you should hear a slight "click" when depressed. Try turning the vacuum back on.

try this link
http://www.espares.co.uk/parts/vacuum-cleaners/belts/panasonic/p/1567/308

Unplug, check if brush has cord wrapped. Check for fuse, if applicable.
Check power lead in another supply socket. Check for reset button, if applicable. Contact Panasonic technical support for suggestions before heading to service centre.

Walmart has Arm & Hammer Brand Vacuum Bags. for Panasonic - U. Works fine on my own MC-5155.

goto> http://www2.panasonic.com/consumer-electronics/support/Home-Appliances/Vacuum-Cleaners/Canister-Vacuums/model.MC-3920

http://www.partstore.com/Model/Matsushita/Panasonic/MCV7395.aspx?SearchTerm=True

Panasonic belt # MC-V2708 is the correct belt for model MC-V7395.

I bought a new one.

Panasonic MC-E 450UK upright vacuum cleaner.
Just had this problem myself...........easy to get at it when you know how.
Panasonic UK wouldn't help me so I spent some time working it out..........here it is.
Remove the hose from its mounting storage at the rear (called hose clip) where the main body of the vacuum cleaner meets the base of the handle assembly. Remove the screw at the rear of the handle assembly which is behind where the hose 'was' situated and is located inside the deep recess.
Using the soft part of your clenched hand as a hammer, knock the base of the handle assembly at the front and it will slide backwards off the main body of the vacuum cleaner. Don't be scared, give it a thump and keep moving it backwards with a few more knocks.
Next remove the two screws at the front which hold the mains cable and on/off switch cover in place.
Finally looking from the rear once more, lift the plastic 'lug' at the top of the cover and which is part of the cover. This will now allow you to release the cover and pull it forward.
There you go! Told you it was easy!
Watch out for the funny little spring at the front behind the cover in the tiny plastic tube where it connects to the small rubber tubing as it could possibly try to escape.
You now have complete access in order to cut the intermittent part of the cable out and remove it from the 'choc' block.
Happy fixing!!
Jack.