SwiftKey freezes in Samsung S5 text and email apps

Latest Android update on Verizon did not help with this.  A couple of days ago it was particularly bad.  Display keyboard remains frozen on the screen when I exit email or text apps (stock apps came with the Verizon set-up 4 years ago).  The usual work-around took multiple attempts (4 as I recall):  Bring up SK, go into RESIZE the keyboard.  Switch it to something else.  Type some garbage for a sample and then exit that.  Presto my full normal display is back!  Funny thing is I almost always use the external Logitech BT keyboard, so I actually wish the whole SK keyboard display would disappear entirely anyway!!!   This has been going on for at least two years, sometimes worse, somethings less worse..BUT getting increasingly annoying  I am looking at getting a new Samsung Galaxy Tab S3 and it would be dreadful if this problem followed me to that new device!