When I place one-off trades, I have specific prices for all components: Buy, TP, SL, etc. I typically enter these directly without consideration of percentages. When I enter values in the Terminal, frequently the entire page hangs and becomes unresponsive. This happens independently of exchange, pair, etc. It happens for TO or SL entry. I usually give up on the trade. No FOMO here 
I use Chrome. This has been going on for a while. It would be good to be able to place a trade again. The perfect terminal is hard to find. Yours is getting close for me 
Thank you for reporting this issue. We have received your bug report about the Trading Terminal hanging when entering specific prices and will investigate it. We will provide an update shortly.
This issue has been resolved.