I'm curious if anyone with a DJI drone has ever completely lost GPS signal while in the air. This question is probably better suited to a drone forum, but I figured a bunch of members here have them as well and might have some insight. I had a recent flight with my Spark (with remote) where it had a good GPS signal and no compass issues prior to taking off. I took it up to just shy of 400', flew about 1/4 mile away, maintaining line of sight, then flew back. However while almost directly overhead and down to about 100', it suddenly lost the GPS signal and started drifting at full speed until it was completely out of sight over the trees. Since landing wasn't an option and I lost track of its position, I opted to just take it higher until it found a signal, which it did. I used RTH and was able to land safely. I'm not sure what was stranger, suddenly losing a GPS signal mid-flight with no nearby obstacles, or the fact that its immediate reaction to losing GPS is to take off as fast as possible in a random direction. I'm just glad it was over the tree line or it definitely would have been lost. Has anyone else experienced this before? I did some research before posting and it doesn't seem all that uncommon, but the only semi-useful information I was able to find was to do a thorough pre-flight check before taking off, which doesn't really help once it is in the air.