I havn't had a glitch on my V4, and i think tamas are being relesed to quickly, V1-V2 took nearly a year! V2-V3 took about 6 months
V3-V4 took about 4 months, V4-V4.5 took about 3 months!
hope i helped, and have a great tama day!
I don't think they 'mess up' i mean they offerd to fix it for you, and if they cant fix, it replace it. But i do think Bandai are releasing tamagotchi versions a bit too quickly, but that is probably so we don't get boared of the same tama!