It was aborted for the third time on Jan 12, when a delay in receiving signals from the proximity and docking sensors was observed during the satellite distance reduction maneuver from 15 m to 3 m. Onboard safe mode operation automatically kicked in to prevent unintentional collision, and this increase the satellite distance to 8 km. ISRO is busy troubleshooting the issue. If sensor problems continue, it can postpone further docking attempts until visibility improves.

The second attempt was aborted on Jan 9 when they found the satellite drift was more than expected. The first attempt was aborted on Jan 7. It's said ISRO found an abort scenario on Jan 6 and they need additional validation through ground simulations of the abort scenario which they didn't clarify what.

As you may know, the SpaDex is ISRO attempt at space rendezvous using two small satellite of 250 kg launched with PSLV on Dec 31, 2024.

Why does ISRO make LEO rendervous sound like a difficult task? I don't remember China carried out similar rendezvous using test satellites like SpaDex. China straight away carried out Shenzhou-8 and Tiangong-1 rendezous on Nov 2011, which of course succeed on first attempt.

Jan 7 this year CZ-3B launched Shijian-25. A satellite with two robotic arms that can rendezvour with any satellite, even an uncoorperating target such as a defunct satellite to bring it out of orbit. In this mission however, it is to perform refueling service to target satellite. It can carry 1.3 ton of fuel, 52% of its total mass, for the refueling mission.