This is a very unwise practice if the primary use of your system is for gaming and not basic productivity. The sleep function for Windows computers is typically handy when you have to move a laptop from one room to another when you work on things like Word Documents or Powerpoint Presentations. When you use your computer primarily for personal use and entertainment, your random access memory can get cluttered over time.
A system that does not reset will not empty the data on the random access memory (by doing a full shut down) and that can eventually cause system instability and possible corruption to the data on your hard disk if you don’t reboot your system every now and then. It is always better to fully shut down your system when you know you will not be actively using it (such as going to bed).
This sounds like there may be a RAM leak or other resources on your computer is overloading your ram. These steps may help prevent this problem in the future:
- Run a Scan and Repair on Overwatch
- Make sure your Overlay programs (Discord, Web Browsers, Cloud Storage services) are closed
- Check to see if any background processes is overloading your computer
This is also a common error if your system does not meet the minimum system requirements of Overwatch.
When you leave a game at the pre-game or the first minute of play, the match will cancel out (this is for the benefit of all remaining players in that match), and you will be penalized appropriately. Only if you crash in the later part can you return (but only have two minutes to do so without penalty).
As always, all crashes and disconnections are penalized as an effort to encourage users to correct any technical issues before attempting to return to play Competitive again. If the troubleshooting steps I have provided do not help and you are still crashing, please start a new post in the technical support forum or start a web ticket for more advanced assistance.