Yes, its frustrating when replies get lost in transit! I would recommend copying just before hitting send and then you have the option of pasting if you need to resend 
Alternatively, Slow66!, if you hit rewind at the top of your screen it might not take you back to the post you intended to post! Are you on Apple, Chrome or Windows? I think the 'losing' of posts is coming about as a result of needing to verify we are not robots!