two layers helped ....but did not solve problem....on to next suggestion....

The plastic table with the real wide lip are not as sturdy as the ones with the thinner lip. They are more sturdy. I use one for my machine & it is also against a wall.

this table is probably between 20-30 years old all wood and metal, the kind that took two men to move....

my sewing machine did the same thing and I had my son in law built another top for my table out of mdf which is very dense and heavy and it made a very big difference. .

I also use the rubber shelf liners for my foot pedal.
If you are using this under the machine, make sure it is positioned correctly. A wood table could be warped.

I had the same problem. I use the long table in my studio so that I can have one machine on each side of the table. So, my DH made a sturdy leg that is under the middle of the table. I also use a mat under the machine. Nothing fancy but it works.

Get a stronger table. That one is to flimsy!

I have a piece of left over carpet under my machine that I use at the cabin and works fine to keep machine stable.

That is what I do too. Works great.

A lot of it is the plastic banquet tables.
I use an old place mat that looks like the rubbermaid cabinet liner, works great. when needed one for surger that crawled, I got out the cabinet liner, cut what I needed. no more crawling.