After the comet lander Philae woke up from its sleep aboard the comet 67P/Churyumov-Gerasimenko, it created excitement among space enthusiasts throughout the world. It again started working as it returned signals to Earth after going in silent mode for months.

It was on July 9, when some problem again occurred since the comet lost the contact with mission scientists.

According to scientists, a fault might have occurred in Philae's radio equipment and as a result of that it was not able to send back signals. Last time, on July 9, a signal from the lander was received by mission scientists at the German Aerospace Centre (DLR), however it unexpectedly stopped working.

As per reports, the scientists were instructing the lander to activate one of the scientific instruments of the probe, the Rosetta Lander Magnetometer and Plasma Monitor. However, the things didn't work. Philae has two transmitters which are programmed to switch back and forth between each one periodically.

According to Dr. Stephen Ulamec, DLR's Philae project leader, "In the telemetry received, we have observed signs that Philae could have moved and that its antennas are thus perhaps more concealed or their orientation might have changed".

Last year, Philae Lander fell on the comet after separating itself from its mother ship, Rosetta, and bounced onto the comet's surface. It fell on the dark side of the comet and went into deep sleep on the shadow of a crater wall.

According to Dr. Ulamec, the profile, where panels are receiving a large amount of sunlight, has undoubtedly changed between June and July.