1. The adjustment of the gear shift drive is broken (see «Gearshift drive - removal, disassembly, installation and adjustment»).
2. The tightening of the nuts securing the gear lever support has loosened (see «Gearshift drive - removal, disassembly, installation and adjustment»).
3. The gearshift drive rod is deformed (see «Gearshift drive - removal, disassembly, installation and adjustment»).
4. Breakage or wear of the plastic parts of the shift mechanism (see «Gearshift drive - removal, disassembly, installation and adjustment»).