Why do I get SSL related errors when using CURL?

Question

PHP

Good day!
I ran into a problem that from time to time (about 5% of all cases) when using the VK API via CURL I get errors related to SSL.
For example:
- # 35 - SSL connect error
- # 56 - SSL read: error:00000000:lib(0):func(0):reason(0), errno 10054 The
options that are used for CURL are:
CURLOPT_CONNECTTIMEOUT => 0
CURLOPT_TIMEOUT => 500
CURLOPT_SSL_VERIFYPEER => 0
CURLOPT_SSL_VERIFYHOST => 2
CURLOPT_HTTPHEADER => ['Content-type: application/x-www-form-urlencoded']
CURLOPT_RETURNTRANSFER => true
CURLOPT_URL => ' https://api.vk.com/method/users.search '
CURLOPT_POST => true
CURLOPT_POSTFIELDS => <defined_post_parameters_according_to_api_method>
What could be the problem? And how could it be fixed?
Thanks in advance!