Microwave beeps and then locks on its own

Just today, my Kenmore microwave has started to beep and then lock. I go through the motions and unlock it, but after a while it starts to beep again and then locks. How do I stop this from happening?

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0

crwdns2944067:02crwdne2944067:0:

Hi,

What is the model number of the microwave?

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

Is there a pattern to the beeps?

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

crwdns2934285:0crwdne2934285:0