Hi! Sometimes there's an issue where the game won't recognize your saves after a crash, but the saves are usually still there are on your computer. If you haven't already, follow the steps here to try and recover your save: 
https://stardewvalleywiki.com/Saves#Save_disappeared_or_doesn.27t_load
You also mention experiencing crashes. Can you share your most recent error log? (Crashes don't always produce an error log, so you may not see any in the folder).
- On Windows, press the windows key + R and enter %appdata%/stardewvalley/errorlogs.
- On Mac, from your desktop click Go in the menubar (in the top right), then "Go to folder..." at the bottom of that menu. Enter ~/.config/StardewValley/ErrorLogs/.
If you have SMAPI installed, the best way to share a log is via 
https://smapi.io/log. Thanks!
		
 
Message: The process cannot access the file because it is being used by another process.
InnerException: 
Stack Trace:    at StardewValley.SaveGame.<Save>d__88.MoveNext() in C:\GitlabRunner\builds\Gq5qA5P4\0\ConcernedApe\stardewvalley\Farmer\Farmer\SaveGame.cs:line 414
   at StardewValley.Menus.SaveGameMenu.update(GameTime time) in C:\GitlabRunner\builds\Gq5qA5P4\0\ConcernedApe\stardewvalley\Farmer\Farmer\Menus\SaveGameMenu.cs:line 123
   at StardewValley.Game1._update(GameTime gameTime) in C:\GitlabRunner\builds\Gq5qA5P4\0\ConcernedApe\stardewvalley\Farmer\Farmer\Game1.cs:line 4080
   at StardewValley.Game1.Update(GameTime gameTime) in C:\GitlabRunner\builds\Gq5qA5P4\0\ConcernedApe\stardewvalley\Farmer\Farmer\Game1.cs:line 3872
   at StardewValley.GameRunner.Update(GameTime gameTime) in C:\GitlabRunner\builds\Gq5qA5P4\0\ConcernedApe\stardewvalley\Farmer\Farmer\LocalMultiplayer.cs:line 1046
   at Microsoft.Xna.Framework.Game.Tick()
   at Microsoft.Xna.Framework.Game.HostIdle(Object sender, EventArgs e)
   at Microsoft.Xna.Framework.GameHost.OnIdle()
   at Microsoft.Xna.Framework.WindowsGameHost.RunOneFrame()
   at Microsoft.Xna.Framework.WindowsGameHost.ApplicationIdle(Object sender, EventArgs e)
   at System.Windows.Forms.Application.ThreadContext.System.Windows.Forms.UnsafeNativeMethods.IMsoComponent.FDoIdle(Int32 grfidlef)
   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.Run(Form mainForm)
   at Microsoft.Xna.Framework.WindowsGameHost.Run()
   at Microsoft.Xna.Framework.Game.RunGame(Boolean useBlockingRun)
   at StardewValley.Program.Main(String[] args) in C:\GitlabRunner\builds\Gq5qA5P4\0\ConcernedApe\stardewvalley\Farmer\Farmer\Program.cs:line 156
Game Version: 1.5.4
SDK Helper: SteamHelper
Game Language: en
GPU: NVIDIA GeForce GTX 650
OS: Win32NT Microsoft Windows NT 6.2.9200.0
In-game Date: winter 10 Y2 Time of Day: 600
Game Location: FarmHouse
Thank you!!!!!