I knew that… was just answering the question 
Anything like conflicting timers, overtly long blocking routines, while loops, delays, etc. can and will cause WDT issues. Unfortunately troubleshooting such can be tricky unless you really know how your code process runs. Working with someone else’s code just adds to the fun 
I am unsure of your issue, or what you are trying to accomplish… but based on the title of this OP topic, here is one of my methods of letting any Blynk sketch run when not connected to Blynk.
If this is not quite what you are running into, then perhaps start your own topic with indepth details and code.