Just had an odd experience on KLAX TWR doing mostly patterns. Chap in a Delta plane wanted to ILS at 25R but it kept disconnecting him before I could okay him to land. Info showed a frequency on his plane of 0.0 ? Asked him to tune TWR which he did. Happened repeatedly then I got a message about not responding despite no outstanding messages shown ? I couldn’t respond to his because he kept going to 0.0
I don’t think he was messing about ? Anyone seen anything similar ?