Search function takes 2 minutes to display "/" input

[Jolsvi]

Hi,

I'm currently using Prestashop v 1.6.1.4. and facing trouble with the search features.

When I try to search product with "/" and "-" it takes around 2 minutes to display. The response time is just too different with the words input, always quick.

The shop is selling spare parts which a lot of product name such as :

- fittings 1/4", 3/8", 1/2"

- part number 4396508/8212652

- replacement for RG-100

Is there any recommendation to solve this issue?

Thank you