Stone resin shower tray mortar bed, slight movement - help!

[stoobloo]

I fitted a stone resin shower tray and levelled and fixed as instructed on a bed of mortar. Nice and solid to walk in 48 hours later. Have now tiled on to and around it and when stepping on the tray there is a slight ‘rock’ from front to back.

Any possible solutions to fix it without removing tiles and the tray?

I can potentially raise it one end (it’s a closet shower) so access one end only, but only maybe 5-10mm.

 

[foxhole]

If you squirt in some resin under it .should stabilise .

 

[stoobloo]

If you squirt in some resin under it .should stabilise .

What kind of resin? Something in a silicone like tube?

 

[robinbanks]

What is the mortar bed set on?

 

[stoobloo]

What is the mortar bed set on?

Concrete.

 

[foxhole]

What kind of resin? Something in a silicone like tube?

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