Gaping mouth and extra saliva

[Dannyboy1901]

Good evening all my 4 month old panther chameleon Leo has recently started walking around is enclosure opening and shutting his mouth randomly.
I then took him out and I saw a bit of extra saliva towards the back of his mouth which made him blow a small little bubble.
No I know that him opening and closing his mouth maybe because he's hot but the extra saliva could be a respiratory infection any ideas if anyone has any information on this.

I'm based in the UK the ambient temperature is between 75 and 85 degrees the Baskin temperature is 85 +

He has a glass vivarium with a wire mesh roof he has an 80 watt bulb with UV built in and he has live plants and plenty of room in space

His diet is now locusts he was on crickets he gets sprayed three to four times a day and has recently started enjoying the mist there was also recently added dripper system

Today was the first day I found this they worried me a little bit

Any advice will be most grateful

 

[Graves923]

When he is basking or resting does he hold his head with his chin upward? Any clicking or popping sounds when he is breathing?

 

[Dannyboy1901]

Not heard anything but I only realised this afternoon and before I realised the light has gone off somewhere to check in the morning he lets me stroke the underneath of his chin and then he will just sit with his tongue I believe and he has been sitting up quite proud with his head up I think sorry to be so vague I'm trying to remember what he was like today.