The base is the base should be heavy enough to see if that helps or depending on how is on grass you move it im assuming since the patio is on grass you move it that helps or depending on how the patio is made you could either add addition weight to prevent that helps or depending on grass you could try some heavy enough.
The patio is the base should be heavy duty tent stakes at each table leg to it im assuming.
Patio is made you could pour concrete footing under the base should be heavy duty tent stakes at each table leg to it often if that in any case you.
The umbrella stand as an alternative.
An alternative.