Wow, did you contact support about it? That’s a terrible experience.
I just can’t deal with MT4’s 1980s design.
I use MT4 for manual trading and MT5 for automating positions with Python (programming language). For charting, I use TradingView but I find it overwhelming at times due to the contradictory trading ideas, so I started building my own tools. I developed a Python script to find support and resistance levels numerically and later created a web app called Infotra (Informative Trading) which analyzes candlestick patterns statistically for data-driven trading. Lately, I’ve been exploring quantitative trading. I am trying to make some sense of that world of insanity 
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Hi @samewise, since the incident can’t be replicate, it will be useless, unless many traders reported the same thing. 
Better to use cTrader or MT5. If i want to be fancy, I can find broker proprietary platform, such as Pepperstone. TV has broken my heart. 
I’ve had some weird issues like that as well, but normally during market news, so the network is getting hammered. I always check my account summary to make sure my exits are recorded, at least if I manually close or if I’m on the app when a order triggers.
Hi @samewise, I agree. My opinion is TV is bad during volatile market. I even have bought TV subscription. I was thought the delay was happened due to free account. But, I doesn’t help neither. So, I wont use TV for trading. It’s enough for market studying only. 
Ah that sucks. I find that as long as I close the mobile app down and open it back up, I can make sure my orders executed. That’s not really great in fast moving markets, but I haven’t had issue with orders not executing.