502 Gateway Prestashop error

Job ID: 37251808

Budget: $30 – $250 CAD

We need to solve this issue urgent

max Budget aviable 70Cad

we have installed app Super Speed - Incredibly fast - Webp, GTmetrix & Google v1.7.5

when you browse sometimes you get 502 error than refresh and site is loaded correctly .
if we disable the exxtension than 502 error is still there and no relaod helps

so we think is error of the extension , ( there is no support anymore )

also if you browse admin/moduls a 500 error comes after reload the modul section is loaded
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