I checked Coinomi support, but there's no mention of "32000" or "overdraft". However discussion about Ethereum wallet/development mention it's caused by lack of gas/ETH to create the transaction[1]. If you attempt to send ETH or ETH token, that's reason you receive such error message. But if you attempt to send Bitcoin, then we don't know what caused it and you might want to contact Coinomi support instead[2].
[1] https://reddit.com/r/ethdev/comments/12z5jho/rpc_error_transaction_would_cause_overdraft_what/
[2] https://coinomi.freshdesk.com/support/home
[1] https://reddit.com/r/ethdev/comments/12z5jho/rpc_error_transaction_would_cause_overdraft_what/
[2] https://coinomi.freshdesk.com/support/home
Thanks for the response. It is indeed an ETH transaction. I couldn't much information either. If it is the reason you mentioned, is it something that I can try to fix? Or just wait?