Coinbase transactions may take time due to heavy traffic on Coinbase website. Sometimes transactions get on pending mode or get expires, in such situations you can always ping on Coinbase helpdesk number anytime. You will get connected to the well-experienced professionals who can inform you the relevant reasons behind your coinbase transaction expiration. They will also tell you the remedies to eradicate such glitches. They are always available to erase your errors and allows you to enjoy Coinbase services.