RS Tel Fading?
The RCB star RS Tel may be starting a possible fade judging by my recent observations below:
Apr 1.829 UT: 10.0
May 20.863 UT: 10.1
May 23.841 UT: 10.6
May 30.579 UT: 10.8
Looking at the AAVSO AID, it does show that this star has semi-regular 'dips' down to just above 11th mag every 350 days or so (at least since the last big decline back in 2006). So it's hard to tell whether this is another brief 'dip' or a fully fledged decline.
It would be worth keeping an eye on it.