Site reloading randomly

Hello

I don’t really know how to describe my issue. Sometimes I’ve got some random pages which will reload constantly
It can be a tag page, or a search page. It happens also with woocommerce with the basket. In that case it empties the basket and people cannot order.
I checked the console using chrome developpers tools but nothing really appears it. I don’t know what to do. Any suggestion?
Thanks a lot in advance!

Kind regards
perrine