After a long connection to the wallet, it offers to reinstall blocks and synchronize all Bitcoin core blocks

[Bitcoin]

After a long connection to the wallet, it offers to reinstall blocks and synchronize all Bitcoin core blocks

1)I installed bitcoin core on an ssd drive. Some time did not include it, a month after the inclusion of bitcoin core when you start the application with ssd asks to re-download all the blocks, the path is correct , and the folder has already downloaded the blocks. I don't understand, my old wallet can't download or wants to download the resulting blocks while offline. Please help to understand.                                      2) If I installed a portable ssd drive I can connect it to any device and use the wallet and funds on it? In such an attempt, it requires downloading blocks again

Source: After a long connection to the wallet, it offers to reinstall blocks and synchronize all Bitcoin core blocks