Is this why I receive stratum connection timeout errors?

This notification is worthless if you don't provide the hash for the file in question.  I just checked 0.13.3 with SHA256 of 41cfeaeefe6092d2a1b1c4812b74d126c9aa75a4f2f1937106d1d56ee3a34f40 and it comes back clean, even with Dr. Web.
 
Check the VirusTotal report:  https://www.virustotal.com/#/file/41cfeaeefe6092d2a1b1c4812b74d126c9aa75a4f2f1937106d1d56ee3a34f40/detection 

Since your Dr. Web is reporting a Trojan, you should definitely check the hash and if it doesn't match, go get a new version downloaded from the official site, using a known and secured network.