I face an issue in Magento ver2.3.5 with one of third-party payment module (stripe).
It’s a temporary solution that works for us.
Firstly, you need to update third party module to latest one or for temporary fix. (Not recommended).
You can update Session.php and path is /vendor/magento/module-checkout/Model/Session.php
find the function public function getQuote() and comment given code.
if ($quote->getTotalsCollectedFlag() === false) {
$quote->collectTotals();
}