Sorry but I've only just seen this - I've not had a problem with BL Touch & Marlin with the 1.x.x branches BUT I have had problems with the voltage.
For me, anything below 4.9v on the 5v rail it was very intermittent to deploying and generally behaving. Since changing electronics (and happened to get a better 5v rail) it has been working consistent (can't say accurately as I think I could have a mechanics issue there).
For me, anything below 4.9v on the 5v rail it was very intermittent to deploying and generally behaving. Since changing electronics (and happened to get a better 5v rail) it has been working consistent (can't say accurately as I think I could have a mechanics issue there).