1. The volume manually does not go above level 8-9 while the knob keeps turning, whereas with the remote control it increases.
2. Even with the remote control, the volume changes on its own suddenly at frequent intervals, resulting in it suddenly becoming much louder or quieter by itself.
3. In the case of line in, when I connect a 3.5 mm jack to double RCA from the TV to the transformer, only one speaker plays (at first both played, but only if the cable was inserted in a very specific position and at an angle in the transformer's plug, obviously a problematic plug), while in any other case both speakers play (FM / Bluetooth).
4. Bluetooth does not connect to all devices. (It initially connected to the laptop, after one day it disconnected and since then I have not managed to reconnect it - although it appears to connect, it does not play, while it works from the mobile phone)
5. The casing moves, resulting in the buttons going inside and not being able to be pressed.
6. FM receives only a few frequencies clearly

Update 24-11-2023
I have had it for almost a year. It has been working for countless hours. I enjoy it and it hasn't had any issues.
Initial updates
The machine was purchased on 28-11-2022. It was connected to speakers from a well-known mini hifi company. Finding FM stations is very easy. The radio has satisfactory reception. A USB with MP3 music files was also installed. The MP3 playback is very good. The music performance is also very good. The machine is great..... The condition is to connect speakers that match the amplifier. The amplifier is 2X18W. The Bluetooth has not been tested yet. Overall, it decently covers a medium-sized room. A very good choice at minimal cost.
Update 14-1-2023
The machine has been playing without any problems for two months now. I also connected two old SONY speakers with a power of 2x80W at 8ohm. It blew them away..... It played flawlessly at very high volumes with very good sound quality. It didn't heat up at all. Therefore, it can easily cover large spaces as well.
For FM, to tune and save stations, you press the play-stop button once. It saves 30 stations in memory.
It also has EQ with preset settings that improve the sound.
The small screen is very convenient as it provides information about the radio station frequency, the track number on the flash drive, the type of connection, etc.
The sound quality is also related to the MP3 files contained in the flash drive. I load MP3 files at 320kb/s that I have processed with audacity software to improve the sound.
The speakers connected to the amplifier do not have to be high wattage, but their sensitivity is important. Higher sensitivity means they play louder. A sensitivity of around 90db is fine.
Update 16-1-2023
Today I bought a Phillips DVD player, which has the same width as the amplifier. It was connected via RCA cable. I wanted it to be able to play the CD discs I have in my collection. It worked perfectly with the amplifier and with very good sound quality.
The only drawback I have noticed so far is that when the DVD player is playing, the amplifier does not give me access to the EQ. I manually adjust the treble and bass. For the use I make, this is not a problem.
Update 21-1-2023
Bluetooth was tested. No code is required for connection. It works flawlessly. No interruptions or interference and with good sound quality. Connecting with the mobile phone is a breeze without any issues.
In summary, with very low cost, I have a device that plays everything, easily connects to other devices with RCA cables or Bluetooth, and I also have a radio. It plays CD discs, MP3 files, etc. If I wanted to play FLAC files now, I can do it through a computer connected via Bluetooth.
So, it survived over time. It is recommended.