I am a non-native speaker of English (I'd rather not say what my native language is). I have noticed that my speech organs (tongue, lips, jaws and also the palate but I'm not so sure if it's the palate) get tired while speaking English for a while. It does not happen when I'm speaking my native language. I suspect it is because my speech organs are not acclimated to the movements they perform for articulating the sounds/ consonant clusters/ patterns of sounds of English.
Is it common for second language learner's speech organs to get tired while speaking the second language? How often does it happen cross-linguistically