I feel forced to make my own thread for this matter since I have noticed that no questions have been addressed on the main bug report thread for more than a year now.
Due to memory/save glitches that have still yet to be patched, I have now been forced to erase my save files on Rocksmith 2014 for PS4 more than five times; over the course of several years, these problems have resulted in the erasure of well over 1000 hours of progress. This problem occurred yet again today, and the only reliable method that I have found to counteract it in the past is to erase save data, NOT game data as I was previously advised. However, doing so after the most recent instance of the memory glitch earlier today, Rocksmith now fails to get past the introduction sequence at all, making the entirety of the game inaccessible.
I have no issues with my RealTone cable or my hard drive; my instrument audio comes through completely fine, and I am able to use them to "pass" the introductory sound check calibration, but the screen simply hangs on the in-game background studio wall after getting rid of the calibration interface. Instrument audio is still playable, and the background speakers still react to the audio, but nothing else happens no matter how much time is allowed to elapse; this type of hang-up is the exact type of crash/freeze that preceded the aforementioned memory glitches which I have reported in the past. Rocksmith 2014 on the PS4 needs to be patched to rectify this issue.
EDIT: I found a solution around the glitched intro calibration test by selecting Disconnected Mode during the introduction sequence. After getting into the main menu and switching back to the RealTone cable, regular play was possible again. Doing a calibration test via the in-game tuner did not cause the type of hangup mentioned above, and a subsequent startup and session of the game did not freeze either. However, this was after seven failed attempts to go through the introduction sequence normally, meaning that some process in the introductory calibration test was nonetheless bugged. Based on my experiences so far with these memory glitches, coupled with the causes that I have been able to rule out, the most likely explanation seems to be that my connection with the Ubisoft servers is dropping in the middle of play, running the risk of corrupting my save data every time that such a disconnect occurs. Any time in the past that the servers were down when I was initially starting the game, I got a message indicating the server problem when the game was transferring between the opening menu and main menu, but I have never in my years of playing received such a notification while in the middle of a session.
In advance of the most common question that I have personally received as well as seeing asked of other users: I always return to the opening title screen before quitting the game, and I wait for close to 10 seconds after the end of every auto-save function in the event that an additional auto-save might suddenly occur. That being said, I feel that the excessive presence of this specific suggestion/fix on the forums is in of itself a rationale for patching the game. Outside of Rocksmith 2014, the only other console games that I have ever encountered with a similar dynamic centered around quitting in an "improper" fashion are the SoulsBorne/Souls-like games made by FromSoftware, and any time that such an exit from one of those games occurs, the player is quickly told upon starting their next session that they had previously quit the game improperly and that continuing to do so may result in a loss of progress or corruption of save data. More than likely, not every single Rocksmith player on the PS4 maintains a Ubisoft profile, much less any presence on these forums, yet it has only been by digging through threads in the support forum that I ever happened upon the discovery that a similar dynamic exists in Rocksmith; if such small movements throughout the game have such a significant impact on players' data, then that dynamic needs to be made abundantly clear in the game itself.