What will fix this issue

When composing an email every two or three sentences that I send end up breaking in the middle, with a period, followed by a capitalized first letter of the next word. Because of this, I must carefully re-read and correct every email. Is there an easy fix?

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

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0

crwdns2942205:01crwdne2942205:0:

Try typing slow (not every time) a lot of phones if you double tap the space bar will make a period so type slow and see if it still does it if not I think that is what is happening and you may be able to turn that off in settings

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

crwdns2934285:0crwdne2934285:0