The issues you mention are mostly the trading platform dependent. When you are choosing a reputed trading platform, you will not face any issues.
Not in bitcoin trading, but in my Forex trading I have faced the many issues like order is not getting executed and not connecting to live market are some of major issues, I have faced in my trading.
Well said and thanks for clearing that out. I think I forgot to tell the thing is altcoin to bitcoin and vice versa.
How about the live markets with different prices? How do you deal with it? Are you picking a website that sells it way cheaper even if it is not that reputable?
you should only choose the reputable and popular exchanges to do your business on. and if you take a look at the prices in these types of sites you can see that they all have same rates.
actually one of the ways to see if an exchange site is good or not is to see if the price is always having delays and also checking the spread. these two can show you how much volume they actually have.