There are really some issues in the past about using coinomi wallet because most of the time the team members are not responding if there are any problems, that is why i avoid putting a huge amount of funds in my coinomi wallet that most of my funds are in my ledger nano x wallet because it is much safer to use.
Hi Kong, Our team respond to every issue which is brought to our attention. If you are aware of something we have missed or if you have an issue yourself which you would like us to address then please, open a ticket at support.coinomi.com explaining those in detail so we can take a look and help with any concerns. Thank you